Task: Data-Imputation (source dataset: tablib)

Please fill in the missing value in the input table. The missing value is denoted by '[MISSING]'. Please only return the value filled in. Do not return the whole table.

No explanation, return the value filled in JSON format: {"value": "filled_value"}. 

Input Table:
| Port   | Pin   | AF0                                                                       | AF1                         | AF2                                                             | AF3               | AF4                                    | AF5                              | AF6                                         | AF7                       |   Unnamed: 10 | Unnamed: 11   |
|:-------|:------|:--------------------------------------------------------------------------|:----------------------------|:----------------------------------------------------------------|:------------------|:---------------------------------------|:---------------------------------|:--------------------------------------------|:--------------------------|--------------:|:--------------|
| None   | None  | SPI1/SPI2/I2S2/USART1/2/LPUART1/USB/LPTIM1/TSC/TIM2/21/22/EVENTOUT/SYS_AF | SPI1/SPI2/I2S2/I2C1/TIM2/21 | SPI1/SPI2/I2S2/LPUART1/USART5/USB/LPTIM1/TIM2/3/EVENTOUT/SYS_AF | I2C1/TSC/EVENTOUT | I2C1/USART1/2/LPUART1/TIM3/22/EVENTOUT | SPI2/I2S2/I2C2/USART1/TIM2/21/22 | I2C1/2/LPUART1/USART4/UASRT5/TIM21/EVENTOUT | I2C3/LPUART1/COMP1/2/TIM3 |           nan | ADC           |
| PortA  | PA0   | None                                                                      | None                        | TIM2_CH1                                                        | TSC_G1_IO1        | USART2_CTS                             | TIM2_ETR                         | USART4_TX                                   | COMP1_OUT                 |           nan | ADC_IN0       |
| PortA  | PA1   | EVENTOUT                                                                  | None                        | TIM2_CH2                                                        | TSC_G1_IO2        | USART2_RTS/USART2_DE                   | TIM21_ETR                        | USART4_RX                                   | None                      |           nan | ADC_IN1       |
| PortA  | PA2   | TIM21_CH1                                                                 | None                        | TIM2_CH3                                                        | TSC_G1_IO3        | USART2_TX                              | None                             | LPUART1_TX                                  | COMP2_OUT                 |           nan | ADC_IN2       |
| PortA  | PA3   | TIM21_CH2                                                                 | None                        | TIM2_CH4                                                        | TSC_G1_IO4        | USART2_RX                              | None                             | LPUART1_RX                                  | None                      |           nan | ADC_IN3       |
| PortA  | PA4   | SPI1_NSS                                                                  | None                        | None                                                            | TSC_G2_IO1        | USART2_CK                              | TIM22_ETR                        | None                                        | None                      |           nan | ADC_IN4       |
| PortA  | PA5   | SPI1_SCK                                                                  | None                        | TIM2_ETR                                                        | TSC_G2_IO2        | None                                   | TIM2_CH1                         | None                                        | None                      |           nan | ADC_IN5       |
| PortA  | PA6   | SPI1_MISO                                                                 | None                        | TIM3_CH1                                                        | TSC_G2_IO3        | LPUART1_CTS                            | TIM22_CH1                        | EVENTOUT                                    | COMP1_OUT                 |           nan | ADC_IN6       |
| PortA  | PA7   | SPI1_MOSI                                                                 | None                        | TIM3_CH2                                                        | TSC_G2_IO4        | None                                   | TIM22_CH2                        | EVENTOUT                                    | COMP2_OUT                 |           nan | ADC_IN7       |
| PortA  | PA8   | MCO                                                                       | None                        | USB_CRS_SYNC                                                    | EVENTOUT          | USART1_CK                              | None                             | None                                        | I2C3_SCL                  |           nan | None          |
| PortA  | PA9   | MCO                                                                       | None                        | None                                                            | TSC_G4_IO1        | USART1_TX                              | None                             | I2C1_SCL                                    | I2C3_SMBA                 |           nan | None          |
| PortA  | PA10  | None                                                                      | None                        | None                                                            | TSC_G4_IO2        | USART1_RX                              | None                             | I2C1_SDA                                    | None                      |           nan | None          |
| PortA  | PA11  | SPI1_MISO                                                                 | None                        | EVENTOUT                                                        | TSC_G4_IO3        | USART1_CTS                             | None                             | None                                        | COMP1_OUT                 |           nan | None          |
| PortA  | PA12  | SPI1_MOSI                                                                 | None                        | EVENTOUT                                                        | TSC_G4_IO4        | USART1_RTS/USART1_DE                   | None                             | None                                        | COMP2_OUT                 |           nan | None          |
| PortA  | PA13  | SWDIO                                                                     | None                        | USB_NOE                                                         | None              | None                                   | None                             | LPUART1_RX                                  | None                      |           nan | None          |
| PortA  | PA14  | SWCLK                                                                     | None                        | None                                                            | None              | USART2_TX                              | None                             | LPUART1_TX                                  | None                      |           nan | None          |
| PortA  | PA15  | SPI1_NSS                                                                  | None                        | TIM2_ETR                                                        | EVENTOUT          | USART2_RX                              | TIM2_CH1                         | USART4_RTS/USART4_DE                        | None                      |           nan | None          |
| PortB  | PB0   | EVENTOUT                                                                  | None                        | TIM3_CH3                                                        | TSC_G3_IO2        | None                                   | None                             | None                                        | None                      |           nan | ADC_IN8       |
| PortB  | PB1   | None                                                                      | None                        | TIM3_CH4                                                        | TSC_G3_IO3        | LPUART1_RTS/LPUART1_DE                 | None                             | None                                        | None                      |           nan | ADC_IN9       |
| PortB  | PB2   | None                                                                      | None                        | LPTIM1_OUT                                                      | TSC_G3_IO4        | None                                   | None                             | None                                        | I2C3_SMBA                 |           nan | None          |
| PortB  | PB3   | SPI1_SCK                                                                  | None                        | TIM2_CH2                                                        | TSC_G5_IO1        | EVENTOUT                               | USART1_RTS/USART1_DE             | USART5_TX                                   | None                      |           nan | None          |
| PortB  | PB4   | SPI1_MISO                                                                 | None                        | TIM3_CH1                                                        | TSC_G5_IO2        | TIM22_CH1                              | USART1_CTS                       | USART5_RX                                   | I2C3_SDA                  |           nan | None          |
| PortB  | PB5   | SPI1_MOSI                                                                 | None                        | LPTIM1_IN1                                                      | I2C1_SMBA         | TIM3_CH2/TIM22_CH2                     | USART1_CK                        | USART5_CK/USART5_RTS/USART5_DE              | None                      |           nan | None          |
| PortB  | PB6   | USART1_TX                                                                 | I2C1_SCL                    | LPTIM1_ETR                                                      | TSC_G5_IO3        | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortB  | PB7   | USART1_RX                                                                 | I2C1_SDA                    | LPTIM1_IN2                                                      | TSC_G5_IO4        | None                                   | None                             | USART4_CTS                                  | None                      |           nan | None          |
| PortB  | PB8   | None                                                                      | None                        | None                                                            | TSC_SYNC          | I2C1_SCL                               | None                             | None                                        | None                      |           nan | None          |
| PortB  | PB9   | None                                                                      | None                        | EVENTOUT                                                        | None              | I2C1_SDA                               | SPI2_NSS/I2S2_WS                 | None                                        | None                      |           nan | None          |
| PortB  | PB10  | None                                                                      | None                        | TIM2_CH3                                                        | TSC_SYNC          | LPUART1_TX                             | SPI2_SCK                         | I2C2_SCL                                    | LPUART1_RX                |           nan | None          |
| PortB  | PB11  | EVENTOUT                                                                  | None                        | TIM2_CH4                                                        | TSC_G6_IO1        | LPUART1_RX                             | None                             | I2C2_SDA                                    | LPUART1_TX                |           nan | None          |
| PortB  | PB12  | SPI2_NSS/I2S2_WS                                                          | None                        | LPUART1_RTS/LPUART1_DE                                          | TSC_G6_IO2        | I2C2_SMBA                              | None                             | EVENTOUT                                    | None                      |           nan | None          |
| PortB  | PB13  | SPI2_SCK/I2S2_CK                                                          | None                        | MCO                                                             | TSC_G6_IO3        | LPUART1_CTS                            | I2C2_SCL                         | TIM21_CH1                                   | None                      |           nan | None          |
| PortB  | PB14  | SPI2_MISO/I2S2_MCK                                                        | None                        | RTC_OUT                                                         | TSC_G6_IO4        | LPUART1_RTS/LPUART1_DE                 | I2C2_SDA                         | TIM21_CH2                                   | None                      |           nan | None          |
| PortB  | PB15  | SPI2_MOSI/I2S2_SD                                                         | None                        | RTC_REFIN                                                       | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortC  | PC0   | LPTIM1_IN1                                                                | None                        | EVENTOUT                                                        | TSC_G7_IO1        | None                                   | None                             | LPUART1_RX                                  | I2C3_SCL                  |           nan | ADC_IN10      |
| PortC  | PC1   | LPTIM1_OUT                                                                | None                        | EVENTOUT                                                        | TSC_G7_IO2        | None                                   | None                             | LPUART1_TX                                  | I2C3_SDA                  |           nan | ADC_IN11      |
| PortC  | PC2   | LPTIM1_IN2                                                                | None                        | SPI2_MISO/I2S2_MCK                                              | TSC_G7_IO3        | None                                   | None                             | None                                        | None                      |           nan | ADC_IN12      |
| PortC  | PC3   | LPTIM1_ETR                                                                | None                        | SPI2_MOSI/I2S2_SD                                               | TSC_G7_IO4        | None                                   | None                             | None                                        | None                      |           nan | ADC_IN13      |
| PortC  | PC4   | EVENTOUT                                                                  | None                        | LPUART1_TX                                                      | None              | None                                   | None                             | None                                        | None                      |           nan | ADC_IN14      |
| PortC  | PC5   | LPUART1_RX                                                                | None                        | TSC_G3_IO1                                                      | None              | None                                   | None                             | None                                        | None                      |           nan | ADC_IN15      |
| PortC  | PC6   | TIM22_CH1                                                                 | None                        | TIM3_CH1                                                        | TSC_G8_IO1        | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortC  | PC7   | TIM22_CH2                                                                 | None                        | TIM3_CH2                                                        | TSC_G8_IO2        | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortC  | PC8   | TIM22_ETR                                                                 | None                        | TIM3_CH3                                                        | TSC_G8_IO3        | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortC  | PC9   | TIM21_ETR                                                                 | None                        | USB_NOE/TIM3_CH4                                                | TSC_G8_IO4        | None                                   | None                             | None                                        | I2C3_SDA                  |           nan | None          |
| PortC  | PC10  | LPUART1_TX                                                                | None                        | None                                                            | None              | None                                   | None                             | USART4_TX                                   | None                      |           nan | None          |
| PortC  | PC11  | LPUART1_RX                                                                | None                        | None                                                            | None              | None                                   | None                             | USART4_RX                                   | None                      |           nan | None          |
| PortC  | PC12  | None                                                                      | None                        | USART5_TX                                                       | None              | None                                   | None                             | USART4_CK                                   | None                      |           nan | None          |
| PortC  | PC13  | None                                                                      | None                        | None                                                            | None              | [MISSING]                              | None                             | None                                        | None                      |           nan | None          |
| PortC  | PC14  | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortC  | PC15  | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD0   | TIM21_CH1                                                                 | SPI2_NSS/I2S2_WS            | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD1   | None                                                                      | SPI2_SCK/I2S2_CK            | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD2   | LPUART1_RTS/LPUART1_DE                                                    | None                        | TIM3_ETR                                                        | None              | None                                   | None                             | USART5_RX                                   | None                      |           nan | None          |
| PortD  | PD3   | USART2_CTS                                                                | None                        | SPI2_MISO/I2S2_MCK                                              | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD4   | USART2_RTS/USART2_DE                                                      | SPI2_MOSI/I2S2_SD           | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD5   | USART2_TX                                                                 | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD6   | USART2_RX                                                                 | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD7   | USART2_CK                                                                 | TIM21_CH2                   | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD8   | LPUART1_TX                                                                | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD9   | LPUART1_RX                                                                | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD10  | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD11  | LPUART1_CTS                                                               | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD12  | LPUART1_RTS/LPUART1_DE                                                    | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD13  | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD14  | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortD  | PD15  | USB_CRS_SYNC                                                              | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE0   | None                                                                      | None                        | EVENTOUT                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE1   | None                                                                      | None                        | EVENTOUT                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE2   | None                                                                      | None                        | TIM3_ETR                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE3   | TIM22_CH1                                                                 | None                        | TIM3_CH1                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE4   | TIM22_CH2                                                                 | None                        | TIM3_CH2                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE5   | TIM21_CH1                                                                 | None                        | TIM3_CH3                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE6   | TIM21_CH2                                                                 | None                        | TIM3_CH4                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE7   | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | USART5_CK/USART5_RTS/USART5_DE              | None                      |           nan | None          |
| PortE  | PE8   | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | USART4_TX                                   | None                      |           nan | None          |
| PortE  | PE9   | TIM2_CH1                                                                  | None                        | TIM2_ETR                                                        | None              | None                                   | None                             | USART4_RX                                   | None                      |           nan | None          |
| PortE  | PE10  | TIM2_CH2                                                                  | None                        | None                                                            | None              | None                                   | None                             | USART5_TX                                   | None                      |           nan | None          |
| PortE  | PE11  | TIM2_CH3                                                                  | None                        | None                                                            | None              | None                                   | None                             | USART5_RX                                   | None                      |           nan | None          |
| PortE  | PE12  | TIM2_CH4                                                                  | None                        | SPI1_NSS                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE13  | None                                                                      | None                        | SPI1_SCK                                                        | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE14  | None                                                                      | None                        | SPI1_MISO                                                       | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortE  | PE15  | None                                                                      | None                        | SPI1_MOSI                                                       | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortH  | PH0   | USB_CRS_SYNC                                                              | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |
| PortH  | PH1   | None                                                                      | None                        | None                                                            | None              | None                                   | None                             | None                                        | None                      |           nan | None          |



row_idx: 46
col_idx: 6
col_name: AF4
label: None
output: value: None
tablib_key: tables/job=github_000005/batch=009026/Hcok1HDE60Zp3nzBk7S1HgE_YVgntT-2FLgoCVsBH-4=