Task: Data-Imputation (source dataset: WebTable)

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:
| Treaty               |   Year | Signed with                     | Where                                       | Purpose                                                                                         | Ceded land                      |
|:---------------------|-------:|:--------------------------------|:--------------------------------------------|:------------------------------------------------------------------------------------------------|:--------------------------------|
| San Lorenzo          |   1795 | Between Spain and United States | San Lorenzo de El Escorial, Spain           | The treaty, also known as Pinckney's Treaty, put Choctaw & Chickasaw country under U.S. control | nan                             |
| Fort Adams           |   1801 | Choctaw                         | Mississippi Territory                       | [MISSING]                                                                                       | 2,641,920 acres (10,691.5 km2)  |
| Fort Confederation   |   1802 | Choctaw                         | Mississippi Territory                       | nan                                                                                             | 10,000 acres (40 km2)           |
| Hoe Buckintoopa      |   1803 | Choctaw                         | Choctaw Nation                              | Small cession of Tombigbee River and redefined English treaty of 1765                           | 853,760 acres (3,455.0 km2)     |
| Mount Dexter         |   1805 | Choctaw                         | Choctaw Nation                              | Large cession from Natchez District to the Tombigbee/Alabama River watershed                    | 4,142,720 acres (16,765.0 km2)  |
| Fort St. Stephens    |   1816 | Choctaw                         | Fort Confederation                          | Ceded all Choctaw land east of Tombigbee River                                                  | 10,000 acres (40 km2)           |
| Doak's Stand         |   1820 | Choctaw                         | Natchez Trace, Choctaw Nation               | Exchanged cession in Mississippi for parcel in Arkansas                                         | 5,169,788 acres (20,921.39 km2) |
| Washington City      |   1825 | Choctaw                         | Exchanged Arkansas land for Oklahoma parcel | 2,000,000 acres (8,100 km2)                                                                     | nan                             |
| Dancing Rabbit Creek |   1830 | Choctaw                         | Choctaw Nation                              | Removal and granting U.S. citizenship to Choctaw who remained                                   | 10,523,130 acres (42,585.6 km2) |
| Pontotoc             |   1832 | Chickasaw                       | Pontitock Creek                             | Seek a home in the west                                                                         | 6,283,804 acres (25,429.65 km2) |



row_idx: 1
col_idx: 4
col_name: Purpose
label: Redefined Choctaw cession to England and permission for whites to use the Natchez Trace