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   | PostalCode   | AddressLine2   | NumberCars   | FirstName   | OwnOrRentFlag   |   Income | MaritalStatus   | LastName   | MiddleInitial   | AddressLine1         | State                | Phone          | Employer                 | NumberCreditCards   | Gender   | City           | Country                  |
|:-----------|:-------------|:---------------|:-------------|:------------|:----------------|---------:|:----------------|:-----------|:----------------|:---------------------|:---------------------|:---------------|:-------------------------|:--------------------|:---------|:---------------|:-------------------------|
| PEL0       | T6b 1i1      |                |              | Netti       | O               |   368776 | W               | PELLAND    |                 | 21847 olympia street | MA                   | 1-712-522-6088 | Brink's                  |                     | f        | Fairbanks      | United States of America |
| LED1       | 77281        | APT. 624       | 5.0          | TRUDY       | U               |   177967 | U               | LEDUC      |                 | 245 congress court   | PA                   | 1-626-426-4298 |                          | 6.0                 | F        | Quebec         | United States of America |
| lat2       | 91355        |                | 2.0          | ireland     | O               |   321772 | S               | latif      |                 | 6517 frailing west   | Alberta              | 1-524-787-8784 |                          | 6.0                 |          | Henderson      | United States of America |
| RUD3       | 36615        |                | 2.0          | Misti       | O               |    25449 | W               | RUDDICK    |                 | 11449 blalock park   | AR                   | 1-741-997-1688 | Air Products & Chemicals | 3.0                 |          | Salem          | Canada                   |
| JAY4       | t6a 1i3      | Apt. 619       | 0.0          | sarena      | O               |   166567 | M               | JAYAMANNE  | M               | 18354 dodd court     | OR                   | 1-002-194-1991 | Oshkosh                  | 4.0                 | f        | Toledo         | Canada                   |
| tod5       | A2b 1v3      |                | 1.0          | Paulette    | R               |    43631 | M               | todo       | Z               | 14117 roxboro street | VA                   | 1-441-371-7651 |                          | 10.0                | M        | Corpus Christi | United States of America |
| Kan6       | 49513        |                | 4.0          | AMALITA     | O               |   466230 |                 | Kanno      | R               | 24697 FLORENCE WEST  | OH                   | 1-957-940-5980 | VeraSun Energy           | 1.0                 | m        | Salt Lake City | Canada                   |
| Din7       | M5d 1v6      |                | 2.0          | Ernesto     | U               |   420243 | M               | Dinkel     | Z               | 6488 applewood drive | Prince Edward Island | 1-768-633-4096 | IDT                      | 7.0                 |          | Brownsville    | United States of America |
| Thi8       | V6c 1q1      |                | 3.0          | Toby        | O               |   141862 | U               | Thibodeaux |                 | 17404 gale court     | NV                   | 1-107-689-2155 | Adams Resources & Energy | 10.0                |          | Escondido      | United States of America |
| May9       | 99716        |                | 0.0          | evangelia   | O               |   402011 | M               | Mayo       |                 | 15913 alexis street  | Ontario              | 1-173-594-6096 | MGIC Investment          |                     |          | Los Angeles    | United States of America |

TableB:
| gncd    | pstlcd       | ddrssln2                                                          |   nmbrcrs | frstnm                      | wnrrntflg   |    ncm | mrtlstts   | lstnm                         | mddlntl   | ddrssln1                                                                    | stt   | phn            | mplr                           | nmbrcrdtcrds   | nmbrchldrn   |   g |   crdtrtng |           ntwrth |
|:--------|:-------------|:------------------------------------------------------------------|----------:|:----------------------------|:------------|-------:|:-----------|:------------------------------|:----------|:----------------------------------------------------------------------------|:------|:---------------|:-------------------------------|:---------------|:-------------|----:|-----------:|-----------------:|
| Iok7501 | Guudshirvcu  | GKOIKEZZMQTPQUQZLSAUUMVBDPAXTWNWSXTYJYQ                           |         3 | wbwsqgtaa                   | U           |  94490 | U          | Iokwiqojocjanndatkdzgymym     | n         | jsurlejkapodmkaccruslfkcqmbcquahsyweopxdxknl                                | MO    | 1-637-119-9996 | FM Global                      |                |              |   7 |        580 | 321776           |
| tia7502 | wyggjewbe    | ocmgcvnexhqhgoyrwpkgaopthdvandlzaaleqccjpjkbirtcqvorobgskhtlgndvn |         4 | QGJWCPAPZMWHYHZTNOYSSOQBI   | R           |   7037 | S          | tiabxgseasiibxakctfzhfwotp    |           | Ggptcoorkpeeigqzevhwhjdxdfbrmidyxsugikhgmuvvpcptuphjlgmipvhrrsgepibdupa     | TX    | 1-560-405-0048 | MGIC Investment                | 2.0            | 4.0          |  48 |        683 |      2.29232e+06 |
| AOI7503 | YMZRQICUTHT  | Cdrxeolwrrxmwmhgexvcstvzz                                         |         1 | BHGXDDPUMBESLQMNEPREPTZNNKM | O           | 419269 | M          | AOIWIWTIHIXOJ                 | u         | Gpcvjzlwouagawronludakqiuhbrbpbkkltrnlkoezgwcawpayfsnejpkmisnryphbtztbfemoy | CT    | 1-261-306-5079 | Ross Stores                    | 2.0            | 5.0          |  14 |        411 | 969707           |
| PJQ7504 | Bcjuycmcen   | WKSBVOFGJHQGAEKUYRZHHPH                                           |         4 | Xgnvppcxgfnmawlupgfa        | U           |  76681 | W          | PJQSPMBUHYQKBOZ               |           | Yxkhkvrobywpdczvwmjgxvnuduavcpyiuceglhaskahgyxqpqjbdroyojouqkzfwvfpsddisy   | UT    | 1-642-299-6655 |                                | 9.0            | 5.0          |  29 |        818 |      3.89946e+06 |
| SDV7505 | Nujxguyehf   | skxijfqpzshmts                                                    |         2 | Tfiozpstcftslqtwkgngiiwo    | R           | 209116 | U          | SDVLJWXENNGWCQMIW             |           | Ddsarhvraiskwmrddncqwvzkmjmxtgnpbtgyop                                      | RI    |                | Alliance One International     | 7.0            | 4.0          |  69 |        370 |      3.74922e+06 |
| Hga7506 | Neigswk      | ZETOHHRKIBHCQCKZODIXJJSXCFY                                       |         0 | fbcahlrhhjoslfzqvvwwvhk     | O           | 212203 | U          | Hgakmykzeunwkiaxayulpwyxrcuev | F         | Ajpkrmtlcbdzr                                                               | DE    | 1-388-257-4273 | Sally Beauty Holdings          | 6.0            | 0.0          |  47 |        833 |      3.65853e+06 |
| Beo7507 | WNCEOQPLW    | LJXAXKUJXQBGWBHJJAAM                                              |         5 | Dcgkohfcwyoaxckalqnkrzwq    | U           |  42018 | M          | Beotomyndkiqryllkvpavllytov   | D         | PKSTPUXQIRGWSXSKWRAJTTNBAOLQKAAJFAPGWIHBWVCHOXLE                            | NM    |                | Wisconsin Energy               | 2.0            | 5.0          |   0 |        536 |      1.73846e+06 |
| Qum7508 | Cskdwtkf     | Jmlgjkjbqhrudrkqrm                                                |         0 | Vmnmcsinflxxmmifydckncc     | R           |  90446 | S          | Qumxrssnd                     |           | gyhrpdbplficrfirmtavitgpfmhnnhvsuoqwxrulxlqrdqkzshqovucentrxlakgkpwbrgtd    | WV    | 1-632-118-1891 | Carpenter Technology           | 0.0            | 0.0          |  46 |        775 |      3.3073e+06  |
| Hud7509 | tcxswloetdt  | Qqcilgblxyikgr                                                    |         1 | Vrkbkkxkddtximspigmlbwzt    | R           |  16274 | M          | Hudlpfwjagzbnznyhamjkhbf      | v         | GJTWIDOQOAPDVVULJGOOJBWTTANDJXOCQHWWZAGLGMJQXJOMWFTFVGXIH                   | NH    | 1-853-806-4986 | Liberty Mutual Insurance Group | 3.0            | 1.0          |   6 |        765 |      1.81642e+06 |
| jba7510 | Fkpemasoukih | Ahtohqjfzfarn                                                     |         5 | RMWCTFTLSVTMCBI             | O           |  22215 | M          | jbabemsfwdyeihxq              |           | Ycltsquohmuugxihqyluhkoy                                                    | WY    | 1-220-687-2027 | Black & Decker                 | 6.0            | 2.0          |  22 |        555 |      2.59925e+06 |



source_headers: AgencyID
PostalCode
AddressLine2
NumberCars
FirstName
OwnOrRentFlag
Income
MaritalStatus
LastName
MiddleInitial
AddressLine1
State
Phone
Employer
NumberCreditCards
target_headers: gncd
pstlcd
ddrssln2
nmbrcrs
frstnm
wnrrntflg
ncm
mrtlstts
lstnm
mddlntl
ddrssln1
stt
phn
mplr
nmbrcrdtcrds
column_mappings: AgencyID
gncd
PostalCode
pstlcd
AddressLine2
ddrssln2
NumberCars
nmbrcrs
FirstName
frstnm
OwnOrRentFlag
wnrrntflg
Income
ncm
MaritalStatus
mrtlstts
LastName
lstnm
MiddleInitial
mddlntl
AddressLine1
ddrssln1
State
stt
Phone
phn
Employer
mplr
NumberCreditCards
nmbrcrdtcrds
output: {"column_mappings": [["AgencyID", "gncd"], ["PostalCode", "pstlcd"], ["AddressLine2", "ddrssln2"], ["NumberCars", "nmbrcrs"], ["FirstName", "frstnm"], ["OwnOrRentFlag", "wnrrntflg"], ["Income", "ncm"], ["MaritalStatus", "mrtlstts"], ["LastName", "lstnm"], ["MiddleInitial", "mddlntl"], ["AddressLine1", "ddrssln1"], ["State", "stt"], ["Phone", "phn"], ["Employer", "mplr"], ["NumberCreditCards", "nmbrcrdtcrds"], ["Gender", null], ["City", null], ["Country", null]]}