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   | MaritalStatus   | Age   |   Income | CreditRating   | AddressLine1         | Phone          | Gender   | NumberChildren   | City           | Country                  | LastName   | FirstName   | MiddleInitial   | AddressLine2   | PostalCode   |
|:-----------|:----------------|:------|---------:|:---------------|:---------------------|:---------------|:---------|:-----------------|:---------------|:-------------------------|:-----------|:------------|:----------------|:---------------|:-------------|
| PEL0       | W               | 20.0  |   368776 | 760.0          | 21847 olympia street | 1-712-522-6088 | f        | 3.0              | Fairbanks      | United States of America | PELLAND    | Netti       |                 |                | T6b 1i1      |
| LED1       | U               | 3.0   |   177967 | 555.0          | 245 congress court   | 1-626-426-4298 | F        | 1.0              | Quebec         | United States of America | LEDUC      | TRUDY       |                 | APT. 624       | 77281        |
| lat2       | S               |       |   321772 | 566.0          | 6517 frailing west   | 1-524-787-8784 |          | 1.0              | Henderson      | United States of America | latif      | ireland     |                 |                | 91355        |
| RUD3       | W               | 77.0  |    25449 |                | 11449 blalock park   | 1-741-997-1688 |          | 1.0              | Salem          | Canada                   | RUDDICK    | Misti       |                 |                | 36615        |
| JAY4       | M               | 21.0  |   166567 | 815.0          | 18354 dodd court     | 1-002-194-1991 | f        | 3.0              | Toledo         | Canada                   | JAYAMANNE  | sarena      | M               | Apt. 619       | t6a 1i3      |
| tod5       | M               | 77.0  |    43631 | 333.0          | 14117 roxboro street | 1-441-371-7651 | M        | 4.0              | Corpus Christi | United States of America | todo       | Paulette    | Z               |                | A2b 1v3      |
| Kan6       |                 | 23.0  |   466230 | 528.0          | 24697 FLORENCE WEST  | 1-957-940-5980 | m        | 0.0              | Salt Lake City | Canada                   | Kanno      | AMALITA     | R               |                | 49513        |
| Din7       | M               | 9.0   |   420243 | 680.0          | 6488 applewood drive | 1-768-633-4096 |          | 2.0              | Brownsville    | United States of America | Dinkel     | Ernesto     | Z               |                | M5d 1v6      |
| Thi8       | U               | 63.0  |   141862 | 761.0          | 17404 gale court     | 1-107-689-2155 |          |                  | Escondido      | United States of America | Thibodeaux | Toby        |                 |                | V6c 1q1      |
| May9       | M               | 32.0  |   402011 | 416.0          | 15913 alexis street  | 1-173-594-6096 |          | 2.0              | Los Angeles    | United States of America | Mayo       | evangelia   |                 |                | 99716        |

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



source_headers: AgencyID
MaritalStatus
Age
Income
CreditRating
AddressLine1
Phone
Gender
NumberChildren
City
Country
target_headers: gncd
mrtlstts
g
ncm
crdtrtng
ddrssln1
phn
gndr
nmbrchldrn
ct
cntr
column_mappings: AgencyID
gncd
MaritalStatus
mrtlstts
Age
g
Income
ncm
CreditRating
crdtrtng
AddressLine1
ddrssln1
Phone
phn
Gender
gndr
NumberChildren
nmbrchldrn
City
ct
Country
cntr
output: {"column_mappings": [["AgencyID", "gncd"], ["MaritalStatus", "mrtlstts"], ["Age", "g"], ["Income", "ncm"], ["CreditRating", "crdtrtng"], ["AddressLine1", "ddrssln1"], ["Phone", "phn"], ["Gender", "gndr"], ["NumberChildren", "nmbrchldrn"], ["City", "ct"], ["Country", "cntr"], ["LastName", null], ["FirstName", null], ["MiddleInitial", null], ["AddressLine2", null], ["PostalCode", null]]}