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   | LastName   | FirstName   | MiddleInitial   | Gender   | AddressLine1         | AddressLine2   | PostalCode   | City           | State                | Country                  |
|:-----------|:-----------|:------------|:----------------|:---------|:---------------------|:---------------|:-------------|:---------------|:---------------------|:-------------------------|
| PEL0       | PELLAND    | Netti       |                 | f        | 21847 olympia street |                | T6b 1i1      | Fairbanks      | MA                   | United States of America |
| LED1       | LEDUC      | TRUDY       |                 | F        | 245 congress court   | APT. 624       | 77281        | Quebec         | PA                   | United States of America |
| lat2       | latif      | ireland     |                 |          | 6517 frailing west   |                | 91355        | Henderson      | Alberta              | United States of America |
| RUD3       | RUDDICK    | Misti       |                 |          | 11449 blalock park   |                | 36615        | Salem          | AR                   | Canada                   |
| JAY4       | JAYAMANNE  | sarena      | M               | f        | 18354 dodd court     | Apt. 619       | t6a 1i3      | Toledo         | OR                   | Canada                   |
| tod5       | todo       | Paulette    | Z               | M        | 14117 roxboro street |                | A2b 1v3      | Corpus Christi | VA                   | United States of America |
| Kan6       | Kanno      | AMALITA     | R               | m        | 24697 FLORENCE WEST  |                | 49513        | Salt Lake City | OH                   | Canada                   |
| Din7       | Dinkel     | Ernesto     | Z               |          | 6488 applewood drive |                | M5d 1v6      | Brownsville    | Prince Edward Island | United States of America |
| Thi8       | Thibodeaux | Toby        |                 |          | 17404 gale court     |                | V6c 1q1      | Escondido      | NV                   | United States of America |
| May9       | Mayo       | evangelia   |                 |          | 15913 alexis street  |                | 99716        | Los Angeles    | Ontario              | United States of America |

TableB:
| gncd    | phn            |    ncm |   nmbrcrs | nmbrchldrn   | mrtlstts   |   g |   crdtrtng | wnrrntflg   | mplr                           | nmbrcrdtcrds   |           ntwrth |
|:--------|:---------------|-------:|----------:|:-------------|:-----------|----:|-----------:|:------------|:-------------------------------|:---------------|-----------------:|
| Iok7501 | 1-637-119-9996 |  94490 |         3 |              | U          |   7 |        580 | U           | FM Global                      |                | 321776           |
| tia7502 | 1-560-405-0048 |   7037 |         4 | 4.0          | S          |  48 |        683 | R           | MGIC Investment                | 2.0            |      2.29232e+06 |
| AOI7503 | 1-261-306-5079 | 419269 |         1 | 5.0          | M          |  14 |        411 | O           | Ross Stores                    | 2.0            | 969707           |
| PJQ7504 | 1-642-299-6655 |  76681 |         4 | 5.0          | W          |  29 |        818 | U           |                                | 9.0            |      3.89946e+06 |
| SDV7505 |                | 209116 |         2 | 4.0          | U          |  69 |        370 | R           | Alliance One International     | 7.0            |      3.74922e+06 |
| Hga7506 | 1-388-257-4273 | 212203 |         0 | 0.0          | U          |  47 |        833 | O           | Sally Beauty Holdings          | 6.0            |      3.65853e+06 |
| Beo7507 |                |  42018 |         5 | 5.0          | M          |   0 |        536 | U           | Wisconsin Energy               | 2.0            |      1.73846e+06 |
| Qum7508 | 1-632-118-1891 |  90446 |         0 | 0.0          | S          |  46 |        775 | R           | Carpenter Technology           | 0.0            |      3.3073e+06  |
| Hud7509 | 1-853-806-4986 |  16274 |         1 | 1.0          | M          |   6 |        765 | R           | Liberty Mutual Insurance Group | 3.0            |      1.81642e+06 |
| jba7510 | 1-220-687-2027 |  22215 |         5 | 2.0          | M          |  22 |        555 | O           | Black & Decker                 | 6.0            |      2.59925e+06 |



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