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   | NumberCars   | CreditRating   | Phone          | NumberCreditCards   | MaritalStatus   | AddressLine1       | OwnOrRentFlag   | City          |         NetWorth | MiddleInitial   | LastName   | FirstName   | Gender   | AddressLine2   | PostalCode   |
|:-----------|:-------------|:---------------|:---------------|:--------------------|:----------------|:-------------------|:----------------|:--------------|-----------------:|:----------------|:-----------|:------------|:---------|:---------------|:-------------|
| PEL0       |              | 327.0          | 1 712 522 6088 |                     | W               | 21847ol5moiaxtreet | O               | Fairbanls     | 188954           |                 | PELLAND    | Netti       | f        |                | T6b 1i1      |
| LED1       | 0.0          | 413.0          | 1 626 426 4298 | 11.0                | U               | 245congr2cscokrt   | U               | Q8ebec        | 393585           |                 | LEDUC      | TRUDY       | F        | APT. 624       | 77281        |
| lat2       | 0.0          | 139.0          | 1 524 787 8784 | 6.0                 | S               | 6517fraulihgeest   | O               | Hende5son     | 389589           |                 | latif      | ireland     |          |                | 91355        |
| RUD3       | 1.0          |                | 1 741 997 1688 | 10.0                | W               | 11449hlalock0afk   | O               | dalem         |      1.19078e+06 |                 | RUDDICK    | Misti       |          |                | 36615        |
| JAY4       | 3.0          | 725.0          | 1 002 194 1991 | 14.0                | M               | 18354d0xdcourt     | O               | goledo        |      1.77066e+06 | M               | JAYAMANNE  | sarena      | f        | Apt. 619       | t6a 1i3      |
| tod5       | 0.0          | 468.0          | 1 441 371 7651 | 1.0                 | M               | 14w17rlxb9rostreet | R               | Corpusxyristi |      3.48207e+06 | Z               | todo       | Paulette    | M        |                | A2b 1v3      |
| Kan6       | 2.0          | 370.0          | 1 957 940 5980 | 5.0                 |                 | 24698FL8REhCEWEST  | O               | ealtLakeCitj  |      2.54766e+06 | R               | Kanno      | AMALITA     | m        |                | 49513        |
| Din7       | 2.0          | 574.0          | 1 768 633 4096 | 4.0                 | M               | 6488xpplewoodsriv3 | U               | Brownavilke   |      1.5731e+06  | Z               | Dinkel     | Ernesto     |          |                | M5d 1v6      |
| Thi8       | 2.0          | 516.0          | 1 107 689 2155 | 3.0                 | U               | 1740rgalec9urt     | O               | Esc8ndido     |      1.08353e+06 |                 | Thibodeaux | Toby        |          |                | V6c 1q1      |
| May9       | 2.0          | 408.0          | 1 173 594 6096 |                     | M               | 1r913alexisst5eef  | O               | L0aAngeles    |      2.02955e+06 |                 | Mayo       | evangelia   |          |                | 99716        |

TableB:
| gncd   | nmbrcrs   | crdtrtng   | phn            | nmbrcrdtcrds   | mrtlstts   | ddrssln1             | wnrrntflg   | ct             |           ntwrth | mddlntl   | stt                  | cntr                     |    ncm | nmbrchldrn   | g    | mplr                     |
|:-------|:----------|:-----------|:---------------|:---------------|:-----------|:---------------------|:------------|:---------------|-----------------:|:----------|:---------------------|:-------------------------|-------:|:-------------|:-----|:-------------------------|
| PEL0   |           | 760.0      | 1-712-522-6088 |                | W          | 21847 olympia street | O           | Fairbanks      |      1.05887e+06 |           | MA                   | United States of America | 368776 | 3.0          | 20.0 | Brink's                  |
| LED1   | 5.0       | 555.0      | 1-626-426-4298 | 6.0            | U          | 245 congress court   | U           | Quebec         |      1.98818e+06 |           | PA                   | United States of America | 177967 | 1.0          | 3.0  |                          |
| lat2   | 2.0       | 566.0      | 1-524-787-8784 | 6.0            | S          | 6517 frailing west   | O           | Henderson      |      3.67313e+06 |           | Alberta              | United States of America | 321772 | 1.0          |      |                          |
| RUD3   | 2.0       |            | 1-741-997-1688 | 3.0            | W          | 11449 blalock park   | O           | Salem          |      2.0059e+06  |           | AR                   | Canada                   |  25449 | 1.0          | 77.0 | Air Products & Chemicals |
| JAY4   | 0.0       | 815.0      | 1-002-194-1991 | 4.0            | M          | 18354 dodd court     | O           | Toledo         | 624736           | M         | OR                   | Canada                   | 166567 | 3.0          | 21.0 | Oshkosh                  |
| tod5   | 1.0       | 333.0      | 1-441-371-7651 | 10.0           | M          | 14117 roxboro street | R           | Corpus Christi |      3.06462e+06 | Z         | VA                   | United States of America |  43631 | 4.0          | 77.0 |                          |
| Kan6   | 4.0       | 528.0      | 1-957-940-5980 | 1.0            |            | 24697 FLORENCE WEST  | O           | Salt Lake City |      3.48913e+06 | R         | OH                   | Canada                   | 466230 | 0.0          | 23.0 | VeraSun Energy           |
| Din7   | 2.0       | 680.0      | 1-768-633-4096 | 7.0            | M          | 6488 applewood drive | U           | Brownsville    |      3.43074e+06 | Z         | Prince Edward Island | United States of America | 420243 | 2.0          | 9.0  | IDT                      |
| Thi8   | 3.0       | 761.0      | 1-107-689-2155 | 10.0           | U          | 17404 gale court     | O           | Escondido      |      1.74361e+06 |           | NV                   | United States of America | 141862 |              | 63.0 | Adams Resources & Energy |
| May9   | 0.0       | 416.0      | 1-173-594-6096 |                | M          | 15913 alexis street  | O           | Los Angeles    | 216299           |           | Ontario              | United States of America | 402011 | 2.0          | 32.0 | MGIC Investment          |



source_headers: AgencyID
NumberCars
CreditRating
Phone
NumberCreditCards
MaritalStatus
AddressLine1
OwnOrRentFlag
City
NetWorth
MiddleInitial
target_headers: gncd
nmbrcrs
crdtrtng
phn
nmbrcrdtcrds
mrtlstts
ddrssln1
wnrrntflg
ct
ntwrth
mddlntl
column_mappings: AgencyID
gncd
NumberCars
nmbrcrs
CreditRating
crdtrtng
Phone
phn
NumberCreditCards
nmbrcrdtcrds
MaritalStatus
mrtlstts
AddressLine1
ddrssln1
OwnOrRentFlag
wnrrntflg
City
ct
NetWorth
ntwrth
MiddleInitial
mddlntl
output: {"column_mappings": [["AgencyID", "gncd"], ["NumberCars", "nmbrcrs"], ["CreditRating", "crdtrtng"], ["Phone", "phn"], ["NumberCreditCards", "nmbrcrdtcrds"], ["MaritalStatus", "mrtlstts"], ["AddressLine1", "ddrssln1"], ["OwnOrRentFlag", "wnrrntflg"], ["City", "ct"], ["NetWorth", "ntwrth"], ["MiddleInitial", "mddlntl"], ["LastName", null], ["FirstName", null], ["Gender", null], ["AddressLine2", null], ["PostalCode", null]]}