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:
| prospect_gncd   | prospect_phn   |   prospect_ncm |   prospect_nmbrcrs | prospect_nmbrchldrn   | prospect_mrtlstts   |   prospect_g |   prospect_crdtrtng | prospect_wnrrntflg   | prospect_mplr                  | prospect_nmbrcrdtcrds   |   prospect_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: prospect_gncd
column_mappings: AgencyID
prospect_gncd
output: {"column_mappings": [["AgencyID", "prospect_gncd"], ["LastName", null], ["FirstName", null], ["MiddleInitial", null], ["Gender", null], ["AddressLine1", null], ["AddressLine2", null], ["PostalCode", null], ["City", null], ["State", null], ["Country", null]]}