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             | Country               | MiddleInitial   | Age   | LastName   | FirstName   | Gender   | AddressLine1         | AddressLine2   | PostalCode   | City           | State                | Phone          |
|:-----------|:---------------------|:----------------------|:----------------|:------|:-----------|:------------|:---------|:---------------------|:---------------|:-------------|:---------------|:---------------------|:---------------|
| PEL0       | Br7nks               | UnitevctatesofAkeruca |                 | 74.0  | PEiLAND    | Netti       | f        | 21847 olympia street |                | T6b 1i1      | Fairbanks      | MA                   | 1-712-522-6088 |
| LED1       |                      | UnktefS4atesifAmerica |                 | 28.0  | LED6C      | TRUDY       | F        | 245 congress court   | APT. 624       | 77281        | Quebec         | PA                   | 1-626-426-4298 |
| lat2       |                      | UnitedStwteworAmrrica |                 |       | lxtif      | ireland     |          | 6517 frailing west   |                | 91355        | Henderson      | Alberta              | 1-524-787-8784 |
| RUD3       | AigProductsChekkcala | Cahada                |                 | 73.0  | RUsDICK    | Misti       |          | 11449 blalock park   |                | 36615        | Salem          | AR                   | 1-741-997-1688 |
| JAY4       | Oshkoah              | Camada                | M               | 49.0  | nAYAMANNE  | sarena      | f        | 18354 dodd court     | Apt. 619       | t6a 1i3      | Toledo         | OR                   | 1-002-194-1991 |
| tod5       |                      | UnitedShatwsofwmerisa | Z               | 125.0 | todo       | Paulette    | M        | 14117 roxboro street |                | A2b 1v3      | Corpus Christi | VA                   | 1-441-371-7651 |
| Kan6       | ceraSunEndrgy        | Cagada                | R               | 79.0  | oanno      | AMALITA     | m        | 24697 FLORENCE WEST  |                | 49513        | Salt Lake City | OH                   | 1-957-940-5980 |
| Din7       | IDT                  | 8nitedStatecpfAmdrica | Z               | 3.0   | Diniel     | Ernesto     |          | 6488 applewood drive |                | M5d 1v6      | Brownsville    | Prince Edward Island | 1-768-633-4096 |
| Thi8       | AdamsRfsougcesEn3rgt | UjitevStatexofAkerica |                 | 2.0   | Th8bodeaix | Toby        |          | 17404 gale court     |                | V6c 1q1      | Escondido      | NV                   | 1-107-689-2155 |
| May9       | MGICInves4men6       | UnitedStatfsogwmrrica |                 | 166.0 | Mayo       | evangelia   |          | 15913 alexis street  |                | 99716        | Los Angeles    | Ontario              | 1-173-594-6096 |

TableB:
| AgID    | Empl                           | Coun                     | MidInit   |   Ag | LaN                           |     In |   NuC | NuChil   | MaSt   |   CreRa | OOReFl   | NuCreCar   |              NWo |
|:--------|:-------------------------------|:-------------------------|:----------|-----:|:------------------------------|-------:|------:|:---------|:-------|--------:|:---------|:-----------|-----------------:|
| Iok7501 | FM Global                      | United States of America | n         |    7 | Iokwiqojocjanndatkdzgymym     |  94490 |     3 |          | U      |     580 | U        |            | 321776           |
| tia7502 | MGIC Investment                | Canada                   |           |   48 | tiabxgseasiibxakctfzhfwotp    |   7037 |     4 | 4.0      | S      |     683 | R        | 2.0        |      2.29232e+06 |
| AOI7503 | Ross Stores                    |                          | u         |   14 | AOIWIWTIHIXOJ                 | 419269 |     1 | 5.0      | M      |     411 | O        | 2.0        | 969707           |
| PJQ7504 |                                | United States of America |           |   29 | PJQSPMBUHYQKBOZ               |  76681 |     4 | 5.0      | W      |     818 | U        | 9.0        |      3.89946e+06 |
| SDV7505 | Alliance One International     | United States of America |           |   69 | SDVLJWXENNGWCQMIW             | 209116 |     2 | 4.0      | U      |     370 | R        | 7.0        |      3.74922e+06 |
| Hga7506 | Sally Beauty Holdings          |                          | F         |   47 | Hgakmykzeunwkiaxayulpwyxrcuev | 212203 |     0 | 0.0      | U      |     833 | O        | 6.0        |      3.65853e+06 |
| Beo7507 | Wisconsin Energy               | Canada                   | D         |    0 | Beotomyndkiqryllkvpavllytov   |  42018 |     5 | 5.0      | M      |     536 | U        | 2.0        |      1.73846e+06 |
| Qum7508 | Carpenter Technology           | United States of America |           |   46 | Qumxrssnd                     |  90446 |     0 | 0.0      | S      |     775 | R        | 0.0        |      3.3073e+06  |
| Hud7509 | Liberty Mutual Insurance Group | United States of America | v         |    6 | Hudlpfwjagzbnznyhamjkhbf      |  16274 |     1 | 1.0      | M      |     765 | R        | 3.0        |      1.81642e+06 |
| jba7510 | Black & Decker                 | Canada                   |           |   22 | jbabemsfwdyeihxq              |  22215 |     5 | 2.0      | M      |     555 | O        | 6.0        |      2.59925e+06 |



source_headers: AgencyID
Employer
Country
MiddleInitial
Age
LastName
target_headers: AgID
Empl
Coun
MidInit
Ag
LaN
column_mappings: AgencyID
AgID
Employer
Empl
Country
Coun
MiddleInitial
MidInit
Age
Ag
LastName
LaN
output: {"column_mappings": [["AgencyID", "AgID"], ["Employer", "Empl"], ["Country", "Coun"], ["MiddleInitial", "MidInit"], ["Age", "Ag"], ["LastName", "LaN"], ["FirstName", null], ["Gender", null], ["AddressLine1", null], ["AddressLine2", null], ["PostalCode", null], ["City", null], ["State", null], ["Phone", null]]}