Task: Schema-Matching (source dataset: HXD)

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:
| ISO3   | Country                      |   Sospechoso |   Deaths |   Confirmed  |   Congenital_Syndrome |   Guillai_Barre_Syndrome |   Imported |   Pregnants |
|:-------|:-----------------------------|-------------:|---------:|-------------:|----------------------:|-------------------------:|-----------:|------------:|
| SWE    | Suecia                       |            0 |        0 |            0 |                     0 |                        0 |          1 |           0 |
| SUR    | Suriname                     |         2712 |        4 |          720 |                     1 |                       10 |          0 |           0 |
| PRT    | Portugal                     |            0 |        0 |            0 |                     0 |                        0 |         18 |           0 |
| ARG    | Argentina                    |         1756 |        0 |           24 |                     0 |                        0 |         23 |          41 |
| PHL    | Philippines                  |            0 |        0 |            0 |                     0 |                        0 |          1 |           0 |
| MEX    | Mexico                       |            0 |        0 |         2133 |                     0 |                        0 |         15 |         953 |
| ESP    | España                       |            0 |        0 |            1 |                     2 |                        0 |        263 |          39 |
| VIR    | United States Virgin Islands |          518 |        0 |          243 |                     0 |                        0 |          0 |         727 |
| CRI    | Costa Rica                   |         1509 |        0 |          839 |                     1 |                        1 |         32 |          20 |
| ECU    | Ecuador                      |         2182 |        0 |          727 |                     0 |                        0 |         19 |         181 |

TableB:
| ISO   | Country                            | Suspected   | Deaths   | Confirmed    | Congenital Syndrome   | Guillain-Barré Syndrome   | Imported   | Pregnants   |
|:------|:-----------------------------------|:------------|:---------|:-------------|:----------------------|:--------------------------|:-----------|:------------|
| SUR   | Suriname                           | 2723        | 4        | 721          | 1                     | 10                        |            |             |
| BRA   | Brazil                             | 196976      | 6        | 78421        | 1911                  | 943                       |            | 16264       |
| URY   | Uruguay                            |             |          |              |                       |                           | 1          |             |
| PRI   | Puerto Rico                        |             | 3        | 17871        | 1                     | 31                        | 1          | 1384        |
| CAN   | Canada                             |             |          |              | 1                     |                           | 279        | 14          |
| VEN   | Venezuela (Bolivarian Republic of) | 57417       |          | 1768         |                       | 836                       |            | 3326        |
| TCA   | Turks and Caicos Islands           |             |          | 2            |                       |                           | 3          |             |
| TTO   | Trinidad and Tobago                |             |          | 375          |                       |                           | 1          | 170         |
| CRI   | Costa Rica                         | 1721        |          | 946          | 1                     | 1                         | 32         | 20          |
| ATG   | Antigua and Barbuda                | 14          |          | 9            |                       |                           | 2          | 1           |



source_headers: ISO3
Country
Sospechoso
Deaths
Confirmed 
Guillai_Barre_Syndrome
Pregnants
Congenital_Syndrome
Imported
target_headers: ISO
Country
Suspected
Deaths
Confirmed 
Guillain-Barré Syndrome
Pregnants
Congenital Syndrome
Imported
column_mappings: ISO3
ISO
Country
Country
Sospechoso
Suspected
Deaths
Deaths
Confirmed 
Confirmed 
Guillai_Barre_Syndrome
Guillain-Barré Syndrome
Pregnants
Pregnants
Congenital_Syndrome
Congenital Syndrome
Imported
Imported
output: {"column_mappings": [["ISO3", "ISO"], ["Country", "Country"], ["Sospechoso", "Suspected"], ["Deaths", "Deaths"], ["Confirmed ", "Confirmed "], ["Congenital_Syndrome", "Congenital Syndrome"], ["Guillai_Barre_Syndrome", "Guillain-Barr\u00e9 Syndrome"], ["Imported", "Imported"], ["Pregnants", "Pregnants"]]}