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   | MiddleInitial   | NumberChildren   | MaritalStatus   | Gender   | FirstName   | LastName   | AddressLine1         | AddressLine2   | PostalCode   | City           | State                | Country                  | Phone          |
|:-----------|:----------------|:-----------------|:----------------|:---------|:------------|:-----------|:---------------------|:---------------|:-------------|:---------------|:---------------------|:-------------------------|:---------------|
| PEL0       |                 | 1.0              | W               | f        | Negti       | PELLAND    | 21847 olympia street |                | T6b 1i1      | Fairbanks      | MA                   | United States of America | 1-712-522-6088 |
| LED1       |                 | 4.0              | U               | F        | TRUsY       | LEDUC      | 245 congress court   | APT. 624       | 77281        | Quebec         | PA                   | United States of America | 1-626-426-4298 |
| lat2       |                 | 1.0              | S               |          | irelane     | latif      | 6517 frailing west   |                | 91355        | Henderson      | Alberta              | United States of America | 1-524-787-8784 |
| RUD3       |                 | 3.0              | W               |          | Mis6i       | RUDDICK    | 11449 blalock park   |                | 36615        | Salem          | AR                   | Canada                   | 1-741-997-1688 |
| JAY4       | M               | 2.0              | M               | f        | darena      | JAYAMANNE  | 18354 dodd court     | Apt. 619       | t6a 1i3      | Toledo         | OR                   | Canada                   | 1-002-194-1991 |
| tod5       | Z               | 1.0              | M               | M        | Paulefte    | todo       | 14117 roxboro street |                | A2b 1v3      | Corpus Christi | VA                   | United States of America | 1-441-371-7651 |
| Kan6       | R               | 4.0              |                 | m        | AjALITA     | Kanno      | 24697 FLORENCE WEST  |                | 49513        | Salt Lake City | OH                   | Canada                   | 1-957-940-5980 |
| Din7       | Z               | 3.0              | M               |          | Ergesto     | Dinkel     | 6488 applewood drive |                | M5d 1v6      | Brownsville    | Prince Edward Island | United States of America | 1-768-633-4096 |
| Thi8       |                 |                  | U               |          | Toby        | Thibodeaux | 17404 gale court     |                | V6c 1q1      | Escondido      | NV                   | United States of America | 1-107-689-2155 |
| May9       |                 | 3.0              | M               |          | 4vangelia   | Mayo       | 15913 alexis street  |                | 99716        | Los Angeles    | Ontario              | United States of America | 1-173-594-6096 |

TableB:
| prospect_gncd   | prospect_mddlntl   | prospect_nmbrchldrn   | prospect_mrtlstts   | prospect_gndr   | prospect_frstnm   |   prospect_ncm | prospect_nmbrcrs   | prospect_g   | prospect_crdtrtng   | prospect_wnrrntflg   | prospect_mplr            | prospect_nmbrcrdtcrds   |   prospect_ntwrth |
|:----------------|:-------------------|:----------------------|:--------------------|:----------------|:------------------|---------------:|:-------------------|:-------------|:--------------------|:---------------------|:-------------------------|:------------------------|------------------:|
| PEL0            |                    | 3.0                   | W                   | f               | Netti             |         368776 |                    | 20.0         | 760.0               | O                    | Brink's                  |                         |       1.05887e+06 |
| LED1            |                    | 1.0                   | U                   | F               | TRUDY             |         177967 | 5.0                | 3.0          | 555.0               | U                    |                          | 6.0                     |       1.98818e+06 |
| lat2            |                    | 1.0                   | S                   |                 | ireland           |         321772 | 2.0                |              | 566.0               | O                    |                          | 6.0                     |       3.67313e+06 |
| RUD3            |                    | 1.0                   | W                   |                 | Misti             |          25449 | 2.0                | 77.0         |                     | O                    | Air Products & Chemicals | 3.0                     |       2.0059e+06  |
| JAY4            | M                  | 3.0                   | M                   | f               | sarena            |         166567 | 0.0                | 21.0         | 815.0               | O                    | Oshkosh                  | 4.0                     |  624736           |
| tod5            | Z                  | 4.0                   | M                   | M               | Paulette          |          43631 | 1.0                | 77.0         | 333.0               | R                    |                          | 10.0                    |       3.06462e+06 |
| Kan6            | R                  | 0.0                   |                     | m               | AMALITA           |         466230 | 4.0                | 23.0         | 528.0               | O                    | VeraSun Energy           | 1.0                     |       3.48913e+06 |
| Din7            | Z                  | 2.0                   | M                   |                 | Ernesto           |         420243 | 2.0                | 9.0          | 680.0               | U                    | IDT                      | 7.0                     |       3.43074e+06 |
| Thi8            |                    |                       | U                   |                 | Toby              |         141862 | 3.0                | 63.0         | 761.0               | O                    | Adams Resources & Energy | 10.0                    |       1.74361e+06 |
| May9            |                    | 2.0                   | M                   |                 | evangelia         |         402011 | 0.0                | 32.0         | 416.0               | O                    | MGIC Investment          |                         |  216299           |



source_headers: AgencyID
MiddleInitial
NumberChildren
MaritalStatus
Gender
FirstName
target_headers: prospect_gncd
prospect_mddlntl
prospect_nmbrchldrn
prospect_mrtlstts
prospect_gndr
prospect_frstnm
column_mappings: AgencyID
prospect_gncd
MiddleInitial
prospect_mddlntl
NumberChildren
prospect_nmbrchldrn
MaritalStatus
prospect_mrtlstts
Gender
prospect_gndr
FirstName
prospect_frstnm
output: {"column_mappings": [["AgencyID", "prospect_gncd"], ["MiddleInitial", "prospect_mddlntl"], ["NumberChildren", "prospect_nmbrchldrn"], ["MaritalStatus", "prospect_mrtlstts"], ["Gender", "prospect_gndr"], ["FirstName", "prospect_frstnm"], ["LastName", null], ["AddressLine1", null], ["AddressLine2", null], ["PostalCode", null], ["City", null], ["State", null], ["Country", null], ["Phone", null]]}