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

TableB:
| gncd   | ddrssln1             | nmbrcrs   | wnrrntflg   | gndr   | lstnm      |    ncm | nmbrchldrn   | mrtlstts   | g    | crdtrtng   | mplr                     | nmbrcrdtcrds   |           ntwrth |
|:-------|:---------------------|:----------|:------------|:-------|:-----------|-------:|:-------------|:-----------|:-----|:-----------|:-------------------------|:---------------|-----------------:|
| PEL0   | 21847 olympia street |           | O           | f      | PELLAND    | 368776 | 3.0          | W          | 20.0 | 760.0      | Brink's                  |                |      1.05887e+06 |
| LED1   | 245 congress court   | 5.0       | U           | F      | LEDUC      | 177967 | 1.0          | U          | 3.0  | 555.0      |                          | 6.0            |      1.98818e+06 |
| lat2   | 6517 frailing west   | 2.0       | O           |        | latif      | 321772 | 1.0          | S          |      | 566.0      |                          | 6.0            |      3.67313e+06 |
| RUD3   | 11449 blalock park   | 2.0       | O           |        | RUDDICK    |  25449 | 1.0          | W          | 77.0 |            | Air Products & Chemicals | 3.0            |      2.0059e+06  |
| JAY4   | 18354 dodd court     | 0.0       | O           | f      | JAYAMANNE  | 166567 | 3.0          | M          | 21.0 | 815.0      | Oshkosh                  | 4.0            | 624736           |
| tod5   | 14117 roxboro street | 1.0       | R           | M      | todo       |  43631 | 4.0          | M          | 77.0 | 333.0      |                          | 10.0           |      3.06462e+06 |
| Kan6   | 24697 FLORENCE WEST  | 4.0       | O           | m      | Kanno      | 466230 | 0.0          |            | 23.0 | 528.0      | VeraSun Energy           | 1.0            |      3.48913e+06 |
| Din7   | 6488 applewood drive | 2.0       | U           |        | Dinkel     | 420243 | 2.0          | M          | 9.0  | 680.0      | IDT                      | 7.0            |      3.43074e+06 |
| Thi8   | 17404 gale court     | 3.0       | O           |        | Thibodeaux | 141862 |              | U          | 63.0 | 761.0      | Adams Resources & Energy | 10.0           |      1.74361e+06 |
| May9   | 15913 alexis street  | 0.0       | O           |        | Mayo       | 402011 | 2.0          | M          | 32.0 | 416.0      | MGIC Investment          |                | 216299           |



source_headers: AgencyID
AddressLine1
NumberCars
OwnOrRentFlag
Gender
LastName
target_headers: gncd
ddrssln1
nmbrcrs
wnrrntflg
gndr
lstnm
column_mappings: AgencyID
gncd
AddressLine1
ddrssln1
NumberCars
nmbrcrs
OwnOrRentFlag
wnrrntflg
Gender
gndr
LastName
lstnm
output: {"column_mappings": [["AgencyID", "gncd"], ["AddressLine1", "ddrssln1"], ["NumberCars", "nmbrcrs"], ["OwnOrRentFlag", "wnrrntflg"], ["Gender", "gndr"], ["LastName", "lstnm"], ["FirstName", null], ["MiddleInitial", null], ["AddressLine2", null], ["PostalCode", null], ["City", null], ["State", null], ["Country", null], ["Phone", null]]}