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   | OwnOrRentFlag   | Phone          | Employer                 | MiddleInitial   | PostalCode   | Gender   | NumberCars   | State                |   Income | MaritalStatus   | LastName   | FirstName   | AddressLine1         | AddressLine2   | City           |
|:-----------|:----------------|:---------------|:-------------------------|:----------------|:-------------|:---------|:-------------|:---------------------|---------:|:----------------|:-----------|:------------|:---------------------|:---------------|:---------------|
| PEL0       | O               | 1-712-522-6088 | Brink's                  |                 | T6b 1i1      | f        |              | MA                   |   368776 | W               | PELLAND    | Netti       | 21847 olympia street |                | Fairbanks      |
| LED1       | U               | 1-626-426-4298 |                          |                 | 77281        | F        | 5.0          | PA                   |   177967 | U               | LEDUC      | TRUDY       | 245 congress court   | APT. 624       | Quebec         |
| lat2       | O               | 1-524-787-8784 |                          |                 | 91355        |          | 2.0          | Alberta              |   321772 | S               | latif      | ireland     | 6517 frailing west   |                | Henderson      |
| RUD3       | O               | 1-741-997-1688 | Air Products & Chemicals |                 | 36615        |          | 2.0          | AR                   |    25449 | W               | RUDDICK    | Misti       | 11449 blalock park   |                | Salem          |
| JAY4       | O               | 1-002-194-1991 | Oshkosh                  | M               | t6a 1i3      | f        | 0.0          | OR                   |   166567 | M               | JAYAMANNE  | sarena      | 18354 dodd court     | Apt. 619       | Toledo         |
| tod5       | R               | 1-441-371-7651 |                          | Z               | A2b 1v3      | M        | 1.0          | VA                   |    43631 | M               | todo       | Paulette    | 14117 roxboro street |                | Corpus Christi |
| Kan6       | O               | 1-957-940-5980 | VeraSun Energy           | R               | 49513        | m        | 4.0          | OH                   |   466230 |                 | Kanno      | AMALITA     | 24697 FLORENCE WEST  |                | Salt Lake City |
| Din7       | U               | 1-768-633-4096 | IDT                      | Z               | M5d 1v6      |          | 2.0          | Prince Edward Island |   420243 | M               | Dinkel     | Ernesto     | 6488 applewood drive |                | Brownsville    |
| Thi8       | O               | 1-107-689-2155 | Adams Resources & Energy |                 | V6c 1q1      |          | 3.0          | NV                   |   141862 | U               | Thibodeaux | Toby        | 17404 gale court     |                | Escondido      |
| May9       | O               | 1-173-594-6096 | MGIC Investment          |                 | 99716        |          | 0.0          | Ontario              |   402011 | M               | Mayo       | evangelia   | 15913 alexis street  |                | Los Angeles    |

TableB:
| gncd    | wnrrntflg   | phn            | mplr                           | mddlntl   | pstlcd       | gndr   |   nmbrcrs | stt   |    ncm | mrtlstts   | cntr                     | nmbrchldrn   |   g |   crdtrtng | nmbrcrdtcrds   |           ntwrth |
|:--------|:------------|:---------------|:-------------------------------|:----------|:-------------|:-------|----------:|:------|-------:|:-----------|:-------------------------|:-------------|----:|-----------:|:---------------|-----------------:|
| Iok7501 | U           | 1-637-119-9996 | FM Global                      | n         | Guudshirvcu  |        |         3 | MO    |  94490 | U          | United States of America |              |   7 |        580 |                | 321776           |
| tia7502 | R           | 1-560-405-0048 | MGIC Investment                |           | wyggjewbe    | M      |         4 | TX    |   7037 | S          | Canada                   | 4.0          |  48 |        683 | 2.0            |      2.29232e+06 |
| AOI7503 | O           | 1-261-306-5079 | Ross Stores                    | u         | YMZRQICUTHT  |        |         1 | CT    | 419269 | M          |                          | 5.0          |  14 |        411 | 2.0            | 969707           |
| PJQ7504 | U           | 1-642-299-6655 |                                |           | Bcjuycmcen   | m      |         4 | UT    |  76681 | W          | United States of America | 5.0          |  29 |        818 | 9.0            |      3.89946e+06 |
| SDV7505 | R           |                | Alliance One International     |           | Nujxguyehf   |        |         2 | RI    | 209116 | U          | United States of America | 4.0          |  69 |        370 | 7.0            |      3.74922e+06 |
| Hga7506 | O           | 1-388-257-4273 | Sally Beauty Holdings          | F         | Neigswk      | F      |         0 | DE    | 212203 | U          |                          | 0.0          |  47 |        833 | 6.0            |      3.65853e+06 |
| Beo7507 | U           |                | Wisconsin Energy               | D         | WNCEOQPLW    | M      |         5 | NM    |  42018 | M          | Canada                   | 5.0          |   0 |        536 | 2.0            |      1.73846e+06 |
| Qum7508 | R           | 1-632-118-1891 | Carpenter Technology           |           | Cskdwtkf     |        |         0 | WV    |  90446 | S          | United States of America | 0.0          |  46 |        775 | 0.0            |      3.3073e+06  |
| Hud7509 | R           | 1-853-806-4986 | Liberty Mutual Insurance Group | v         | tcxswloetdt  |        |         1 | NH    |  16274 | M          | United States of America | 1.0          |   6 |        765 | 3.0            |      1.81642e+06 |
| jba7510 | O           | 1-220-687-2027 | Black & Decker                 |           | Fkpemasoukih | m      |         5 | WY    |  22215 | M          | Canada                   | 2.0          |  22 |        555 | 6.0            |      2.59925e+06 |



source_headers: AgencyID
OwnOrRentFlag
Phone
Employer
MiddleInitial
PostalCode
Gender
NumberCars
State
Income
MaritalStatus
target_headers: gncd
wnrrntflg
phn
mplr
mddlntl
pstlcd
gndr
nmbrcrs
stt
ncm
mrtlstts
column_mappings: AgencyID
gncd
OwnOrRentFlag
wnrrntflg
Phone
phn
Employer
mplr
MiddleInitial
mddlntl
PostalCode
pstlcd
Gender
gndr
NumberCars
nmbrcrs
State
stt
Income
ncm
MaritalStatus
mrtlstts
output: {"column_mappings": [["AgencyID", "gncd"], ["OwnOrRentFlag", "wnrrntflg"], ["Phone", "phn"], ["Employer", "mplr"], ["MiddleInitial", "mddlntl"], ["PostalCode", "pstlcd"], ["Gender", "gndr"], ["NumberCars", "nmbrcrs"], ["State", "stt"], ["Income", "ncm"], ["MaritalStatus", "mrtlstts"], ["LastName", null], ["FirstName", null], ["AddressLine1", null], ["AddressLine2", null], ["City", null]]}