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 |
|:----------------|:---------------|---------------:|:-------------------|:----------------------|:--------------------|:-------------|:--------------------|:---------------------|:-------------------------|:------------------------|------------------:|
| PEL0            | 1-712-522-6088 |         368776 |                    | 3.0                   | W                   | 20.0         | 760.0               | O                    | Brink's                  |                         |       1.05887e+06 |
| LED1            | 1-626-426-4298 |         177967 | 5.0                | 1.0                   | U                   | 3.0          | 555.0               | U                    |                          | 6.0                     |       1.98818e+06 |
| lat2            | 1-524-787-8784 |         321772 | 2.0                | 1.0                   | S                   |              | 566.0               | O                    |                          | 6.0                     |       3.67313e+06 |
| RUD3            | 1-741-997-1688 |          25449 | 2.0                | 1.0                   | W                   | 77.0         |                     | O                    | Air Products & Chemicals | 3.0                     |       2.0059e+06  |
| JAY4            | 1-002-194-1991 |         166567 | 0.0                | 3.0                   | M                   | 21.0         | 815.0               | O                    | Oshkosh                  | 4.0                     |  624736           |
| tod5            | 1-441-371-7651 |          43631 | 1.0                | 4.0                   | M                   | 77.0         | 333.0               | R                    |                          | 10.0                    |       3.06462e+06 |
| Kan6            | 1-957-940-5980 |         466230 | 4.0                | 0.0                   |                     | 23.0         | 528.0               | O                    | VeraSun Energy           | 1.0                     |       3.48913e+06 |
| Din7            | 1-768-633-4096 |         420243 | 2.0                | 2.0                   | M                   | 9.0          | 680.0               | U                    | IDT                      | 7.0                     |       3.43074e+06 |
| Thi8            | 1-107-689-2155 |         141862 | 3.0                |                       | U                   | 63.0         | 761.0               | O                    | Adams Resources & Energy | 10.0                    |       1.74361e+06 |
| May9            | 1-173-594-6096 |         402011 | 0.0                | 2.0                   | M                   | 32.0         | 416.0               | O                    | MGIC Investment          |                         |  216299           |



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]]}