Task: Schema-Matching (source dataset: prospect)

Task: 
Please identify the matching columns between Table A and Table B. For each column in Table A, specify the corresponding column in Table B. If a column in A has no corresponding column in Table B, you can map it to null. Represent each column mapping using a pair of column headers in a list, i.e., [Table A Column, Table B column or null]. Provide the mapping for each column in Table A and return all mappings in a list.

No explanation and return the matching columns in a structured JSON format: {"column_mappings": <a list of column pairs>}.

TableA:
| AgencyID   | Employer                 | LastName   | PostalCode   | AddressLine2   | CreditRating   | FirstName   | MiddleInitial   | Gender   | AddressLine1         | City           | State                | Country                  | Phone          |
|:-----------|:-------------------------|:-----------|:-------------|:---------------|:---------------|:------------|:----------------|:---------|:---------------------|:---------------|:---------------------|:-------------------------|:---------------|
| PEL0       | Brink's                  | PELLAND    | T6b 1i1      |                | 760.0          | Netti       |                 | f        | 21847 olympia street | Fairbanks      | MA                   | United States of America | 1-712-522-6088 |
| LED1       |                          | LEDUC      | 77281        | APT. 624       | 555.0          | TRUDY       |                 | F        | 245 congress court   | Quebec         | PA                   | United States of America | 1-626-426-4298 |
| lat2       |                          | latif      | 91355        |                | 566.0          | ireland     |                 |          | 6517 frailing west   | Henderson      | Alberta              | United States of America | 1-524-787-8784 |
| RUD3       | Air Products & Chemicals | RUDDICK    | 36615        |                |                | Misti       |                 |          | 11449 blalock park   | Salem          | AR                   | Canada                   | 1-741-997-1688 |
| JAY4       | Oshkosh                  | JAYAMANNE  | t6a 1i3      | Apt. 619       | 815.0          | sarena      | M               | f        | 18354 dodd court     | Toledo         | OR                   | Canada                   | 1-002-194-1991 |
| tod5       |                          | todo       | A2b 1v3      |                | 333.0          | Paulette    | Z               | M        | 14117 roxboro street | Corpus Christi | VA                   | United States of America | 1-441-371-7651 |
| Kan6       | VeraSun Energy           | Kanno      | 49513        |                | 528.0          | AMALITA     | R               | m        | 24697 FLORENCE WEST  | Salt Lake City | OH                   | Canada                   | 1-957-940-5980 |
| Din7       | IDT                      | Dinkel     | M5d 1v6      |                | 680.0          | Ernesto     | Z               |          | 6488 applewood drive | Brownsville    | Prince Edward Island | United States of America | 1-768-633-4096 |
| Thi8       | Adams Resources & Energy | Thibodeaux | V6c 1q1      |                | 761.0          | Toby        |                 |          | 17404 gale court     | Escondido      | NV                   | United States of America | 1-107-689-2155 |
| May9       | MGIC Investment          | Mayo       | 99716        |                | 416.0          | evangelia   |                 |          | 15913 alexis street  | Los Angeles    | Ontario              | United States of America | 1-173-594-6096 |

TableB:
| AgencyID   | Employer                       | LastName                      | PostalCode   | AddressLine2                                                      |   CreditRating |   Income |   NumberCars | NumberChildren   | MaritalStatus   |   Age | OwnOrRentFlag   | NumberCreditCards   |         NetWorth |
|:-----------|:-------------------------------|:------------------------------|:-------------|:------------------------------------------------------------------|---------------:|---------:|-------------:|:-----------------|:----------------|------:|:----------------|:--------------------|-----------------:|
| Iok7501    | FM Global                      | Iokwiqojocjanndatkdzgymym     | Guudshirvcu  | GKOIKEZZMQTPQUQZLSAUUMVBDPAXTWNWSXTYJYQ                           |            580 |    94490 |            3 |                  | U               |     7 | U               |                     | 321776           |
| tia7502    | MGIC Investment                | tiabxgseasiibxakctfzhfwotp    | wyggjewbe    | ocmgcvnexhqhgoyrwpkgaopthdvandlzaaleqccjpjkbirtcqvorobgskhtlgndvn |            683 |     7037 |            4 | 4.0              | S               |    48 | R               | 2.0                 |      2.29232e+06 |
| AOI7503    | Ross Stores                    | AOIWIWTIHIXOJ                 | YMZRQICUTHT  | Cdrxeolwrrxmwmhgexvcstvzz                                         |            411 |   419269 |            1 | 5.0              | M               |    14 | O               | 2.0                 | 969707           |
| PJQ7504    |                                | PJQSPMBUHYQKBOZ               | Bcjuycmcen   | WKSBVOFGJHQGAEKUYRZHHPH                                           |            818 |    76681 |            4 | 5.0              | W               |    29 | U               | 9.0                 |      3.89946e+06 |
| SDV7505    | Alliance One International     | SDVLJWXENNGWCQMIW             | Nujxguyehf   | skxijfqpzshmts                                                    |            370 |   209116 |            2 | 4.0              | U               |    69 | R               | 7.0                 |      3.74922e+06 |
| Hga7506    | Sally Beauty Holdings          | Hgakmykzeunwkiaxayulpwyxrcuev | Neigswk      | ZETOHHRKIBHCQCKZODIXJJSXCFY                                       |            833 |   212203 |            0 | 0.0              | U               |    47 | O               | 6.0                 |      3.65853e+06 |
| Beo7507    | Wisconsin Energy               | Beotomyndkiqryllkvpavllytov   | WNCEOQPLW    | LJXAXKUJXQBGWBHJJAAM                                              |            536 |    42018 |            5 | 5.0              | M               |     0 | U               | 2.0                 |      1.73846e+06 |
| Qum7508    | Carpenter Technology           | Qumxrssnd                     | Cskdwtkf     | Jmlgjkjbqhrudrkqrm                                                |            775 |    90446 |            0 | 0.0              | S               |    46 | R               | 0.0                 |      3.3073e+06  |
| Hud7509    | Liberty Mutual Insurance Group | Hudlpfwjagzbnznyhamjkhbf      | tcxswloetdt  | Qqcilgblxyikgr                                                    |            765 |    16274 |            1 | 1.0              | M               |     6 | R               | 3.0                 |      1.81642e+06 |
| jba7510    | Black & Decker                 | jbabemsfwdyeihxq              | Fkpemasoukih | Ahtohqjfzfarn                                                     |            555 |    22215 |            5 | 2.0              | M               |    22 | O               | 6.0                 |      2.59925e+06 |



source_headers: AgencyID
Employer
LastName
PostalCode
AddressLine2
CreditRating
target_headers: AgencyID
Employer
LastName
PostalCode
AddressLine2
CreditRating
column_mappings: AgencyID
AgencyID
Employer
Employer
LastName
LastName
PostalCode
PostalCode
AddressLine2
AddressLine2
CreditRating
CreditRating
output: {"column_mappings": [["AgencyID", "AgencyID"], ["Employer", "Employer"], ["LastName", "LastName"], ["PostalCode", "PostalCode"], ["AddressLine2", "AddressLine2"], ["CreditRating", "CreditRating"], ["FirstName", null], ["MiddleInitial", null], ["Gender", null], ["AddressLine1", null], ["City", null], ["State", null], ["Country", null], ["Phone", null]]}