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   | Employer                 | CreditRating   | PostalCode   | FirstName   | AddressLine2   | LastName   | MiddleInitial   | Gender   | AddressLine1         | City           | State                | Country                  | Phone          |
|:-----------|:-------------------------|:---------------|:-------------|:------------|:---------------|:-----------|:----------------|:---------|:---------------------|:---------------|:---------------------|:-------------------------|:---------------|
| PEL0       | Brink's                  | 760.0          | T6b 1i1      | Netti       |                | PELLAND    |                 | f        | 21847 olympia street | Fairbanks      | MA                   | United States of America | 1-712-522-6088 |
| LED1       |                          | 555.0          | 77281        | TRUDY       | APT. 624       | LEDUC      |                 | F        | 245 congress court   | Quebec         | PA                   | United States of America | 1-626-426-4298 |
| lat2       |                          | 566.0          | 91355        | ireland     |                | latif      |                 |          | 6517 frailing west   | Henderson      | Alberta              | United States of America | 1-524-787-8784 |
| RUD3       | Air Products & Chemicals |                | 36615        | Misti       |                | RUDDICK    |                 |          | 11449 blalock park   | Salem          | AR                   | Canada                   | 1-741-997-1688 |
| JAY4       | Oshkosh                  | 815.0          | t6a 1i3      | sarena      | Apt. 619       | JAYAMANNE  | M               | f        | 18354 dodd court     | Toledo         | OR                   | Canada                   | 1-002-194-1991 |
| tod5       |                          | 333.0          | A2b 1v3      | Paulette    |                | todo       | Z               | M        | 14117 roxboro street | Corpus Christi | VA                   | United States of America | 1-441-371-7651 |
| Kan6       | VeraSun Energy           | 528.0          | 49513        | AMALITA     |                | Kanno      | R               | m        | 24697 FLORENCE WEST  | Salt Lake City | OH                   | Canada                   | 1-957-940-5980 |
| Din7       | IDT                      | 680.0          | M5d 1v6      | Ernesto     |                | Dinkel     | Z               |          | 6488 applewood drive | Brownsville    | Prince Edward Island | United States of America | 1-768-633-4096 |
| Thi8       | Adams Resources & Energy | 761.0          | V6c 1q1      | Toby        |                | Thibodeaux |                 |          | 17404 gale court     | Escondido      | NV                   | United States of America | 1-107-689-2155 |
| May9       | MGIC Investment          | 416.0          | 99716        | evangelia   |                | Mayo       |                 |          | 15913 alexis street  | Los Angeles    | Ontario              | United States of America | 1-173-594-6096 |

TableB:
| prospect_AgeID   | prospect_Em              | prospect_CrRat   | prospect_PoCo   | prospect_FirN   | prospect_AdLi2   |   prospect_In | prospect_NumC   | prospect_NuChil   | prospect_MarSta   | prospect_Ag   | prospect_OwOReF   | prospect_NumCrCar   |    prospect_NWor |
|:-----------------|:-------------------------|:-----------------|:----------------|:----------------|:-----------------|--------------:|:----------------|:------------------|:------------------|:--------------|:------------------|:--------------------|-----------------:|
| PEL0             | Brink's                  | 760.0            | T6b 1i1         | Netti           |                  |        368776 |                 | 3.0               | W                 | 20.0          | O                 |                     |      1.05887e+06 |
| LED1             |                          | 555.0            | 77281           | TRUDY           | APT. 624         |        177967 | 5.0             | 1.0               | U                 | 3.0           | U                 | 6.0                 |      1.98818e+06 |
| lat2             |                          | 566.0            | 91355           | ireland         |                  |        321772 | 2.0             | 1.0               | S                 |               | O                 | 6.0                 |      3.67313e+06 |
| RUD3             | Air Products & Chemicals |                  | 36615           | Misti           |                  |         25449 | 2.0             | 1.0               | W                 | 77.0          | O                 | 3.0                 |      2.0059e+06  |
| JAY4             | Oshkosh                  | 815.0            | t6a 1i3         | sarena          | Apt. 619         |        166567 | 0.0             | 3.0               | M                 | 21.0          | O                 | 4.0                 | 624736           |
| tod5             |                          | 333.0            | A2b 1v3         | Paulette        |                  |         43631 | 1.0             | 4.0               | M                 | 77.0          | R                 | 10.0                |      3.06462e+06 |
| Kan6             | VeraSun Energy           | 528.0            | 49513           | AMALITA         |                  |        466230 | 4.0             | 0.0               |                   | 23.0          | O                 | 1.0                 |      3.48913e+06 |
| Din7             | IDT                      | 680.0            | M5d 1v6         | Ernesto         |                  |        420243 | 2.0             | 2.0               | M                 | 9.0           | U                 | 7.0                 |      3.43074e+06 |
| Thi8             | Adams Resources & Energy | 761.0            | V6c 1q1         | Toby            |                  |        141862 | 3.0             |                   | U                 | 63.0          | O                 | 10.0                |      1.74361e+06 |
| May9             | MGIC Investment          | 416.0            | 99716           | evangelia       |                  |        402011 | 0.0             | 2.0               | M                 | 32.0          | O                 |                     | 216299           |



source_headers: AgencyID
Employer
CreditRating
PostalCode
FirstName
AddressLine2
target_headers: prospect_AgeID
prospect_Em
prospect_CrRat
prospect_PoCo
prospect_FirN
prospect_AdLi2
column_mappings: AgencyID
prospect_AgeID
Employer
prospect_Em
CreditRating
prospect_CrRat
PostalCode
prospect_PoCo
FirstName
prospect_FirN
AddressLine2
prospect_AdLi2
output: {"column_mappings": [["AgencyID", "prospect_AgeID"], ["Employer", "prospect_Em"], ["CreditRating", "prospect_CrRat"], ["PostalCode", "prospect_PoCo"], ["FirstName", "prospect_FirN"], ["AddressLine2", "prospect_AdLi2"], ["LastName", null], ["MiddleInitial", null], ["Gender", null], ["AddressLine1", null], ["City", null], ["State", null], ["Country", null], ["Phone", null]]}