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   | Country                  |         NetWorth | AddressLine2   | Phone          | Employer                 |   Income | NumberCreditCards   | MiddleInitial   | OwnOrRentFlag   | FirstName   | LastName   | Gender   | AddressLine1         | PostalCode   | City           |
|:-----------|:-------------------------|-----------------:|:---------------|:---------------|:-------------------------|---------:|:--------------------|:----------------|:----------------|:------------|:-----------|:---------|:---------------------|:-------------|:---------------|
| PEL0       | United States of America |      1.05887e+06 |                | 1-712-522-6088 | Brink's                  |   368776 |                     |                 | O               | Netti       | PELLAND    | f        | 21847 olympia street | T6b 1i1      | Fairbanks      |
| LED1       | United States of America |      1.98818e+06 | APT. 624       | 1-626-426-4298 |                          |   177967 | 6.0                 |                 | U               | TRUDY       | LEDUC      | F        | 245 congress court   | 77281        | Quebec         |
| lat2       | United States of America |      3.67313e+06 |                | 1-524-787-8784 |                          |   321772 | 6.0                 |                 | O               | ireland     | latif      |          | 6517 frailing west   | 91355        | Henderson      |
| RUD3       | Canada                   |      2.0059e+06  |                | 1-741-997-1688 | Air Products & Chemicals |    25449 | 3.0                 |                 | O               | Misti       | RUDDICK    |          | 11449 blalock park   | 36615        | Salem          |
| JAY4       | Canada                   | 624736           | Apt. 619       | 1-002-194-1991 | Oshkosh                  |   166567 | 4.0                 | M               | O               | sarena      | JAYAMANNE  | f        | 18354 dodd court     | t6a 1i3      | Toledo         |
| tod5       | United States of America |      3.06462e+06 |                | 1-441-371-7651 |                          |    43631 | 10.0                | Z               | R               | Paulette    | todo       | M        | 14117 roxboro street | A2b 1v3      | Corpus Christi |
| Kan6       | Canada                   |      3.48913e+06 |                | 1-957-940-5980 | VeraSun Energy           |   466230 | 1.0                 | R               | O               | AMALITA     | Kanno      | m        | 24697 FLORENCE WEST  | 49513        | Salt Lake City |
| Din7       | United States of America |      3.43074e+06 |                | 1-768-633-4096 | IDT                      |   420243 | 7.0                 | Z               | U               | Ernesto     | Dinkel     |          | 6488 applewood drive | M5d 1v6      | Brownsville    |
| Thi8       | United States of America |      1.74361e+06 |                | 1-107-689-2155 | Adams Resources & Energy |   141862 | 10.0                |                 | O               | Toby        | Thibodeaux |          | 17404 gale court     | V6c 1q1      | Escondido      |
| May9       | United States of America | 216299           |                | 1-173-594-6096 | MGIC Investment          |   402011 |                     |                 | O               | evangelia   | Mayo       |          | 15913 alexis street  | 99716        | Los Angeles    |

TableB:
| gncd   | cntr                     |           ntwrth | ddrssln2   | phn            | mplr                     |    ncm | nmbrcrdtcrds   | mddlntl   | wnrrntflg   | frstnm    | stt                  | nmbrcrs   | nmbrchldrn   | mrtlstts   | g    | crdtrtng   |
|:-------|:-------------------------|-----------------:|:-----------|:---------------|:-------------------------|-------:|:---------------|:----------|:------------|:----------|:---------------------|:----------|:-------------|:-----------|:-----|:-----------|
| PEL0   | United States of America |      1.05887e+06 |            | 1-712-522-6088 | Brink's                  | 368776 |                |           | O           | Netti     | MA                   |           | 3.0          | W          | 20.0 | 760.0      |
| LED1   | United States of America |      1.98818e+06 | APT. 624   | 1-626-426-4298 |                          | 177967 | 6.0            |           | U           | TRUDY     | PA                   | 5.0       | 1.0          | U          | 3.0  | 555.0      |
| lat2   | United States of America |      3.67313e+06 |            | 1-524-787-8784 |                          | 321772 | 6.0            |           | O           | ireland   | Alberta              | 2.0       | 1.0          | S          |      | 566.0      |
| RUD3   | Canada                   |      2.0059e+06  |            | 1-741-997-1688 | Air Products & Chemicals |  25449 | 3.0            |           | O           | Misti     | AR                   | 2.0       | 1.0          | W          | 77.0 |            |
| JAY4   | Canada                   | 624736           | Apt. 619   | 1-002-194-1991 | Oshkosh                  | 166567 | 4.0            | M         | O           | sarena    | OR                   | 0.0       | 3.0          | M          | 21.0 | 815.0      |
| tod5   | United States of America |      3.06462e+06 |            | 1-441-371-7651 |                          |  43631 | 10.0           | Z         | R           | Paulette  | VA                   | 1.0       | 4.0          | M          | 77.0 | 333.0      |
| Kan6   | Canada                   |      3.48913e+06 |            | 1-957-940-5980 | VeraSun Energy           | 466230 | 1.0            | R         | O           | AMALITA   | OH                   | 4.0       | 0.0          |            | 23.0 | 528.0      |
| Din7   | United States of America |      3.43074e+06 |            | 1-768-633-4096 | IDT                      | 420243 | 7.0            | Z         | U           | Ernesto   | Prince Edward Island | 2.0       | 2.0          | M          | 9.0  | 680.0      |
| Thi8   | United States of America |      1.74361e+06 |            | 1-107-689-2155 | Adams Resources & Energy | 141862 | 10.0           |           | O           | Toby      | NV                   | 3.0       |              | U          | 63.0 | 761.0      |
| May9   | United States of America | 216299           |            | 1-173-594-6096 | MGIC Investment          | 402011 |                |           | O           | evangelia | Ontario              | 0.0       | 2.0          | M          | 32.0 | 416.0      |



source_headers: AgencyID
Country
NetWorth
AddressLine2
Phone
Employer
Income
NumberCreditCards
MiddleInitial
OwnOrRentFlag
FirstName
target_headers: gncd
cntr
ntwrth
ddrssln2
phn
mplr
ncm
nmbrcrdtcrds
mddlntl
wnrrntflg
frstnm
column_mappings: AgencyID
gncd
Country
cntr
NetWorth
ntwrth
AddressLine2
ddrssln2
Phone
phn
Employer
mplr
Income
ncm
NumberCreditCards
nmbrcrdtcrds
MiddleInitial
mddlntl
OwnOrRentFlag
wnrrntflg
FirstName
frstnm
output: {"column_mappings": [["AgencyID", "gncd"], ["Country", "cntr"], ["NetWorth", "ntwrth"], ["AddressLine2", "ddrssln2"], ["Phone", "phn"], ["Employer", "mplr"], ["Income", "ncm"], ["NumberCreditCards", "nmbrcrdtcrds"], ["MiddleInitial", "mddlntl"], ["OwnOrRentFlag", "wnrrntflg"], ["FirstName", "frstnm"], ["LastName", null], ["Gender", null], ["AddressLine1", null], ["PostalCode", null], ["City", null]]}