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                  | Age   | Gender   | Phone          | Employer                 | State                | NumberCreditCards   | MiddleInitial   | MaritalStatus   | NumberCars   | LastName   | FirstName   | AddressLine1         | AddressLine2   | PostalCode   |
|:-----------|:-------------------------|:------|:---------|:---------------|:-------------------------|:---------------------|:--------------------|:----------------|:----------------|:-------------|:-----------|:------------|:---------------------|:---------------|:-------------|
| PEL0       | United States of America | 20.0  | f        | 1-712-522-6088 | Brink's                  | MA                   |                     |                 | W               |              | PELLAND    | Netti       | 21847 olympia street |                | T6b 1i1      |
| LED1       | United States of America | 3.0   | F        | 1-626-426-4298 |                          | PA                   | 6.0                 |                 | U               | 5.0          | LEDUC      | TRUDY       | 245 congress court   | APT. 624       | 77281        |
| lat2       | United States of America |       |          | 1-524-787-8784 |                          | Alberta              | 6.0                 |                 | S               | 2.0          | latif      | ireland     | 6517 frailing west   |                | 91355        |
| RUD3       | Canada                   | 77.0  |          | 1-741-997-1688 | Air Products & Chemicals | AR                   | 3.0                 |                 | W               | 2.0          | RUDDICK    | Misti       | 11449 blalock park   |                | 36615        |
| JAY4       | Canada                   | 21.0  | f        | 1-002-194-1991 | Oshkosh                  | OR                   | 4.0                 | M               | M               | 0.0          | JAYAMANNE  | sarena      | 18354 dodd court     | Apt. 619       | t6a 1i3      |
| tod5       | United States of America | 77.0  | M        | 1-441-371-7651 |                          | VA                   | 10.0                | Z               | M               | 1.0          | todo       | Paulette    | 14117 roxboro street |                | A2b 1v3      |
| Kan6       | Canada                   | 23.0  | m        | 1-957-940-5980 | VeraSun Energy           | OH                   | 1.0                 | R               |                 | 4.0          | Kanno      | AMALITA     | 24697 FLORENCE WEST  |                | 49513        |
| Din7       | United States of America | 9.0   |          | 1-768-633-4096 | IDT                      | Prince Edward Island | 7.0                 | Z               | M               | 2.0          | Dinkel     | Ernesto     | 6488 applewood drive |                | M5d 1v6      |
| Thi8       | United States of America | 63.0  |          | 1-107-689-2155 | Adams Resources & Energy | NV                   | 10.0                |                 | U               | 3.0          | Thibodeaux | Toby        | 17404 gale court     |                | V6c 1q1      |
| May9       | United States of America | 32.0  |          | 1-173-594-6096 | MGIC Investment          | Ontario              |                     |                 | M               | 0.0          | Mayo       | evangelia   | 15913 alexis street  |                | 99716        |

TableB:
| prospect_AgID   | prospect_Coun            | prospect_Ag   | prospect_Ge   | prospect_Pho   | prospect_Em              | prospect_Sta         | prospect_NumCrCar   | prospect_MiInit   | prospect_MarSt   | prospect_NuCa   | prospect_Ci    |   prospect_Inc | prospect_NumChi   | prospect_CrRa   | prospect_OORF   |     prospect_NWo |
|:----------------|:-------------------------|:--------------|:--------------|:---------------|:-------------------------|:---------------------|:--------------------|:------------------|:-----------------|:----------------|:---------------|---------------:|:------------------|:----------------|:----------------|-----------------:|
| PEL0            | United States of America | 20.0          | f             | 1-712-522-6088 | Brink's                  | MA                   |                     |                   | W                |                 | Fairbanks      |         368776 | 3.0               | 760.0           | O               |      1.05887e+06 |
| LED1            | United States of America | 3.0           | F             | 1-626-426-4298 |                          | PA                   | 6.0                 |                   | U                | 5.0             | Quebec         |         177967 | 1.0               | 555.0           | U               |      1.98818e+06 |
| lat2            | United States of America |               |               | 1-524-787-8784 |                          | Alberta              | 6.0                 |                   | S                | 2.0             | Henderson      |         321772 | 1.0               | 566.0           | O               |      3.67313e+06 |
| RUD3            | Canada                   | 77.0          |               | 1-741-997-1688 | Air Products & Chemicals | AR                   | 3.0                 |                   | W                | 2.0             | Salem          |          25449 | 1.0               |                 | O               |      2.0059e+06  |
| JAY4            | Canada                   | 21.0          | f             | 1-002-194-1991 | Oshkosh                  | OR                   | 4.0                 | M                 | M                | 0.0             | Toledo         |         166567 | 3.0               | 815.0           | O               | 624736           |
| tod5            | United States of America | 77.0          | M             | 1-441-371-7651 |                          | VA                   | 10.0                | Z                 | M                | 1.0             | Corpus Christi |          43631 | 4.0               | 333.0           | R               |      3.06462e+06 |
| Kan6            | Canada                   | 23.0          | m             | 1-957-940-5980 | VeraSun Energy           | OH                   | 1.0                 | R                 |                  | 4.0             | Salt Lake City |         466230 | 0.0               | 528.0           | O               |      3.48913e+06 |
| Din7            | United States of America | 9.0           |               | 1-768-633-4096 | IDT                      | Prince Edward Island | 7.0                 | Z                 | M                | 2.0             | Brownsville    |         420243 | 2.0               | 680.0           | U               |      3.43074e+06 |
| Thi8            | United States of America | 63.0          |               | 1-107-689-2155 | Adams Resources & Energy | NV                   | 10.0                |                   | U                | 3.0             | Escondido      |         141862 |                   | 761.0           | O               |      1.74361e+06 |
| May9            | United States of America | 32.0          |               | 1-173-594-6096 | MGIC Investment          | Ontario              |                     |                   | M                | 0.0             | Los Angeles    |         402011 | 2.0               | 416.0           | O               | 216299           |



source_headers: AgencyID
Country
Age
Gender
Phone
Employer
State
NumberCreditCards
MiddleInitial
MaritalStatus
NumberCars
target_headers: prospect_AgID
prospect_Coun
prospect_Ag
prospect_Ge
prospect_Pho
prospect_Em
prospect_Sta
prospect_NumCrCar
prospect_MiInit
prospect_MarSt
prospect_NuCa
column_mappings: AgencyID
prospect_AgID
Country
prospect_Coun
Age
prospect_Ag
Gender
prospect_Ge
Phone
prospect_Pho
Employer
prospect_Em
State
prospect_Sta
NumberCreditCards
prospect_NumCrCar
MiddleInitial
prospect_MiInit
MaritalStatus
prospect_MarSt
NumberCars
prospect_NuCa
output: {"column_mappings": [["AgencyID", "prospect_AgID"], ["Country", "prospect_Coun"], ["Age", "prospect_Ag"], ["Gender", "prospect_Ge"], ["Phone", "prospect_Pho"], ["Employer", "prospect_Em"], ["State", "prospect_Sta"], ["NumberCreditCards", "prospect_NumCrCar"], ["MiddleInitial", "prospect_MiInit"], ["MaritalStatus", "prospect_MarSt"], ["NumberCars", "prospect_NuCa"], ["LastName", null], ["FirstName", null], ["AddressLine1", null], ["AddressLine2", null], ["PostalCode", null]]}