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   | CreditRating   | Age   | NumberChildren   | MiddleInitial   | FirstName   | LastName   | Gender   | AddressLine1         | AddressLine2   | PostalCode   | City           | State                | Country                  |
|:-----------|:---------------|:------|:-----------------|:----------------|:------------|:-----------|:---------|:---------------------|:---------------|:-------------|:---------------|:---------------------|:-------------------------|
| PEL0       | 406.0          | 12.0  | 2.0              |                 | jetti       | PELLAND    | f        | 21847 olympia street |                | T6b 1i1      | Fairbanks      | MA                   | United States of America |
| LED1       | 454.0          | 31.0  | 0.0              |                 | TtUDY       | LEDUC      | F        | 245 congress court   | APT. 624       | 77281        | Quebec         | PA                   | United States of America |
| lat2       | 1053.0         |       | 1.0              |                 | irelanc     | latif      |          | 6517 frailing west   |                | 91355        | Henderson      | Alberta              | United States of America |
| RUD3       |                | 28.0  | 2.0              |                 | histi       | RUDDICK    |          | 11449 blalock park   |                | 36615        | Salem          | AR                   | Canada                   |
| JAY4       | 1020.0         | 24.0  | 2.0              | M               | sar2na      | JAYAMANNE  | f        | 18354 dodd court     | Apt. 619       | t6a 1i3      | Toledo         | OR                   | Canada                   |
| tod5       | 691.0          | 37.0  | 1.0              | Z               | Paklette    | todo       | M        | 14117 roxboro street |                | A2b 1v3      | Corpus Christi | VA                   | United States of America |
| Kan6       | 694.0          | 50.0  | 1.0              | R               | zMALITA     | Kanno      | m        | 24697 FLORENCE WEST  |                | 49513        | Salt Lake City | OH                   | Canada                   |
| Din7       | 838.0          | 28.0  | 1.0              | Z               | Ernestk     | Dinkel     |          | 6488 applewood drive |                | M5d 1v6      | Brownsville    | Prince Edward Island | United States of America |
| Thi8       | 977.0          | 20.0  |                  |                 | Toby        | Thibodeaux |          | 17404 gale court     |                | V6c 1q1      | Escondido      | NV                   | United States of America |
| May9       | 549.0          | 11.0  | 1.0              |                 | efangelia   | Mayo       |          | 15913 alexis street  |                | 99716        | Los Angeles    | Ontario              | United States of America |

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



source_headers: AgencyID
CreditRating
Age
NumberChildren
MiddleInitial
FirstName
target_headers: gncd
crdtrtng
g
nmbrchldrn
mddlntl
frstnm
column_mappings: AgencyID
gncd
CreditRating
crdtrtng
Age
g
NumberChildren
nmbrchldrn
MiddleInitial
mddlntl
FirstName
frstnm
output: {"column_mappings": [["AgencyID", "gncd"], ["CreditRating", "crdtrtng"], ["Age", "g"], ["NumberChildren", "nmbrchldrn"], ["MiddleInitial", "mddlntl"], ["FirstName", "frstnm"], ["LastName", null], ["Gender", null], ["AddressLine1", null], ["AddressLine2", null], ["PostalCode", null], ["City", null], ["State", null], ["Country", null]]}