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   |   Income | MaritalStatus   | MiddleInitial   | NumberChildren   | Employer             |         NetWorth | AddressLine1       | CreditRating   | NumberCreditCards   | Country               | LastName   | FirstName   | Gender   | AddressLine2   | PostalCode   |
|:-----------|---------:|:----------------|:----------------|:-----------------|:---------------------|-----------------:|:-------------------|:---------------|:--------------------|:----------------------|:-----------|:------------|:---------|:---------------|:-------------|
| PEL0       |   186816 | W               |                 | 1.0              | Brinkq               | 447334           | 21837olyhp7astreet | 349.0          |                     | UnitewStatfsofzherica | PELLAND    | Netti       | f        |                | T6b 1i1      |
| LED1       |   411416 | U               |                 | 1.0              |                      | 762519           | 244d8ngresscourt   | 895.0          | 14.0                | kniterStatesofAmeticq | LEDUC      | TRUDY       | F        | APT. 624       | 77281        |
| lat2       |   522424 | S               |                 | 2.0              |                      |      2.36861e+06 | 6417fdailinnwest   | 867.0          | 10.0                | Un7redSyatesofAmericz | latif      | ireland     |          |                | 91355        |
| RUD3       |   411156 | W               |                 | 4.0              | AirP5oductsxhemicwlq | 824132           | 114r9blalocklarl   |                | 9.0                 | Cansda                | RUDDICK    | Misti       |          |                | 36615        |
| JAY4       |   387934 | M               | M               | 5.0              | Oshkowh              |      1.59316e+06 | 18e54doddcourf     | 573.0          | 4.0                 | Canadw                | JAYAMANNE  | sarena      | f        | Apt. 619       | t6a 1i3      |
| tod5       |   439057 | M               | Z               | 2.0              |                      | 366465           | 14117f9xbor9street | 817.0          | 6.0                 | UnitefStates8fAnerkca | todo       | Paulette    | M        |                | A2b 1v3      |
| Kan6       |   412874 |                 | R               | 1.0              | V4raSunEgergy        | 970951           | 2e697FLkRENCEWEdT  | 543.0          | 12.0                | Canadw                | Kanno      | AMALITA     | m        |                | 49513        |
| Din7       |   122173 | M               | Z               | 3.0              | IDT                  |      1.45987e+06 | 6e88applewioddr9ve | 965.0          | 8.0                 | UnitedxtateepfAmericq | Dinkel     | Ernesto     |          |                | M5d 1v6      |
| Thi8       |   215540 | U               |                 |                  | xdamsResourcdsEnefgh |      2.04387e+06 | 17404gaoscourt     | 654.0          | 9.0                 | UnitedStateqogAmerocq | Thibodeaux | Toby        |          |                | V6c 1q1      |
| May9       |   210790 | M               |                 | 1.0              | MGICIncestmen6       |      1.38312e+06 | 15913qlsxisstr3et  | 611.0          |                     | UmitedStatedofwm4rica | Mayo       | evangelia   |          |                | 99716        |

TableB:
| gncd    |    ncm | mrtlstts   | mddlntl   | nmbrchldrn   | mplr                           |           ntwrth | ddrssln1                                                                    |   crdtrtng | nmbrcrdtcrds   | cntr                     | ct         | stt   | phn            |   nmbrcrs |   g | wnrrntflg   |
|:--------|-------:|:-----------|:----------|:-------------|:-------------------------------|-----------------:|:----------------------------------------------------------------------------|-----------:|:---------------|:-------------------------|:-----------|:------|:---------------|----------:|----:|:------------|
| Iok7501 |  94490 | U          | n         |              | FM Global                      | 321776           | jsurlejkapodmkaccruslfkcqmbcquahsyweopxdxknl                                |        580 |                | United States of America | Baltimore  | MO    | 1-637-119-9996 |         3 |   7 | U           |
| tia7502 |   7037 | S          |           | 4.0          | MGIC Investment                |      2.29232e+06 | Ggptcoorkpeeigqzevhwhjdxdfbrmidyxsugikhgmuvvpcptuphjlgmipvhrrsgepibdupa     |        683 | 2.0            | Canada                   | Kitchener  | TX    | 1-560-405-0048 |         4 |  48 | R           |
| AOI7503 | 419269 | M          | u         | 5.0          | Ross Stores                    | 969707           | Gpcvjzlwouagawronludakqiuhbrbpbkkltrnlkoezgwcawpayfsnejpkmisnryphbtztbfemoy |        411 | 2.0            |                          | Saint John | CT    | 1-261-306-5079 |         1 |  14 | O           |
| PJQ7504 |  76681 | W          |           | 5.0          |                                |      3.89946e+06 | Yxkhkvrobywpdczvwmjgxvnuduavcpyiuceglhaskahgyxqpqjbdroyojouqkzfwvfpsddisy   |        818 | 9.0            | United States of America | Berkeley   | UT    | 1-642-299-6655 |         4 |  29 | U           |
| SDV7505 | 209116 | U          |           | 4.0          | Alliance One International     |      3.74922e+06 | Ddsarhvraiskwmrddncqwvzkmjmxtgnpbtgyop                                      |        370 | 7.0            | United States of America | Missoula   | RI    |                |         2 |  69 | R           |
| Hga7506 | 212203 | U          | F         | 0.0          | Sally Beauty Holdings          |      3.65853e+06 | Ajpkrmtlcbdzr                                                               |        833 | 6.0            |                          | Salinas    | DE    | 1-388-257-4273 |         0 |  47 | O           |
| Beo7507 |  42018 | M          | D         | 5.0          | Wisconsin Energy               |      1.73846e+06 | PKSTPUXQIRGWSXSKWRAJTTNBAOLQKAAJFAPGWIHBWVCHOXLE                            |        536 | 2.0            | Canada                   | San Jose   | NM    |                |         5 |   0 | U           |
| Qum7508 |  90446 | S          |           | 0.0          | Carpenter Technology           |      3.3073e+06  | gyhrpdbplficrfirmtavitgpfmhnnhvsuoqwxrulxlqrdqkzshqovucentrxlakgkpwbrgtd    |        775 | 0.0            | United States of America | Cleveland  | WV    | 1-632-118-1891 |         0 |  46 | R           |
| Hud7509 |  16274 | M          | v         | 1.0          | Liberty Mutual Insurance Group |      1.81642e+06 | GJTWIDOQOAPDVVULJGOOJBWTTANDJXOCQHWWZAGLGMJQXJOMWFTFVGXIH                   |        765 | 3.0            | United States of America | Huntington | NH    | 1-853-806-4986 |         1 |   6 | R           |
| jba7510 |  22215 | M          |           | 2.0          | Black & Decker                 |      2.59925e+06 | Ycltsquohmuugxihqyluhkoy                                                    |        555 | 6.0            | Canada                   | Paterson   | WY    | 1-220-687-2027 |         5 |  22 | O           |



source_headers: AgencyID
Income
MaritalStatus
MiddleInitial
NumberChildren
Employer
NetWorth
AddressLine1
CreditRating
NumberCreditCards
Country
target_headers: gncd
ncm
mrtlstts
mddlntl
nmbrchldrn
mplr
ntwrth
ddrssln1
crdtrtng
nmbrcrdtcrds
cntr
column_mappings: AgencyID
gncd
Income
ncm
MaritalStatus
mrtlstts
MiddleInitial
mddlntl
NumberChildren
nmbrchldrn
Employer
mplr
NetWorth
ntwrth
AddressLine1
ddrssln1
CreditRating
crdtrtng
NumberCreditCards
nmbrcrdtcrds
Country
cntr
output: {"column_mappings": [["AgencyID", "gncd"], ["Income", "ncm"], ["MaritalStatus", "mrtlstts"], ["MiddleInitial", "mddlntl"], ["NumberChildren", "nmbrchldrn"], ["Employer", "mplr"], ["NetWorth", "ntwrth"], ["AddressLine1", "ddrssln1"], ["CreditRating", "crdtrtng"], ["NumberCreditCards", "nmbrcrdtcrds"], ["Country", "cntr"], ["LastName", null], ["FirstName", null], ["Gender", null], ["AddressLine2", null], ["PostalCode", null]]}