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   | StartDate   | EndDate    | Area   |   Item Code | Item                                                                                                  |   Year | Unit     | Value   |
|:-------|:------------|:-----------|:-------|------------:|:------------------------------------------------------------------------------------------------------|-------:|:---------|:--------|
| GIN    | 2000-01-01  | 2002-12-31 | Guinea |       21034 | Percent of arable land equipped for irrigation (percent) (3-year average)                             |   2002 | %        | 4.2     |
| GIN    | 2013-01-01  | 2013-12-31 | Guinea |       21048 | Percentage of population using at least basic sanitation services (percent)                           |   2013 | %        | 21.3    |
| GIN    | 2000-01-01  | 2002-12-31 | Guinea |       21012 | Share of dietary energy supply derived from cereals, roots and tubers (kcal/cap/day) (3-year average) |   2002 | %        | 61      |
| GIN    | 2003-01-01  | 2003-12-31 | Guinea |       21041 | Percentage of children under 5 years of age who are overweight (modelled estimates) (percent)         |   2003 | %        | 6.3     |
| GIN    | 2006-01-01  | 2006-12-31 | Guinea |       21048 | Percentage of population using at least basic sanitation services (percent)                           |   2006 | %        | 13.9    |
| GIN    | 2011-01-01  | 2011-12-31 | Guinea |       21032 | Political stability and absence of violence/terrorism (index)                                         |   2011 | index    | -1.39   |
| GIN    | 2015-01-01  | 2017-12-31 | Guinea |      210011 | Number of people undernourished (million) (3-year average)                                            |   2017 | millions |         |
| GIN    | 2016-01-01  | 2016-12-31 | Guinea |       21032 | Political stability and absence of violence/terrorism (index)                                         |   2016 | index    | -0.39   |
| GIN    | 2009-01-01  | 2009-12-31 | Guinea |       21043 | Prevalence of anemia among women of reproductive age (15-49 years)                                    |   2009 | %        | 51.8    |
| GIN    | 2007-01-01  | 2009-12-31 | Guinea |       21033 | Value of food imports in total merchandise exports (percent) (3-year average)                         |   2009 | %        | 26      |

TableB:
| SvyDate             | ADM0_NAME   | ADM1_NAME   | ADM2_NAME   | AdminStrata   | Variable               | VariableDescription                                                               | Demographic           |        Mean |
|:--------------------|:------------|:------------|:------------|:--------------|:-----------------------|:----------------------------------------------------------------------------------|:----------------------|------------:|
| 2015-10-01T00:00:00 | Guinea      |             |             | N'Zerekore    | rCSI>=1                | prevalence-->equals to 1 if household using coping strategies                     |                       |     0.8629  |
| 2015-10-01T00:00:00 | Guinea      |             |             |               | RestrictConsumption>=1 | prevalence-->equals to 1 if household uses this strategy 1 or more times per week | F,Bush pit latrine    |     0.65931 |
| 2015-11-01T00:00:00 | Guinea      |             |             | Kindia        | Sentiment              | Sentiment of free response statement                                              |                       |     0.01376 |
| 2019-02-01T00:00:00 | Guinea      |             |             | Guinea        | Dairy                  | # of days household eating this food item per week                                |                       |     1.69571 |
| 2017-12-01T00:00:00 | Guinea      |             |             | Faranah       | FCS                    | food consumption score                                                            |                       |    52.1337  |
| 2015-11-01T00:00:00 | Guinea      |             |             |               | BorrowOrHelp           | # of days household using this coping strategy per week                           | Shared flush toilet   |     1.59605 |
| 2016-02-01T00:00:00 | Guinea      |             |             |               | RestrictConsumption>=1 | prevalence-->equals to 1 if household uses this strategy 1 or more times per week | M,Shared flush toilet |     0.55473 |
| 2017-12-01T00:00:00 | Guinea      |             |             |               | LimitPortionSize       | # of days household using this coping strategy per week                           | Latrine               |     1.41319 |
| 2015-11-01T00:00:00 | Guinea      |             |             | Guinea        | ManLbr                 | Daily wages for manual labor                                                      |                       | 23724.4     |
| 2015-08-01T00:00:00 | Guinea      |             |             |               | ReduceNumMeals>=1      | prevalence-->equals to 1 if household uses this strategy 1 or more times per week | M                     |     0.58837 |



source_headers: Area
Item Code
Item
Value
target_headers: ADM0_NAME
Variable
VariableDescription
Mean
column_mappings: Area
ADM0_NAME
Item Code
Variable
Item
VariableDescription
Value
Mean
output: {"column_mappings": [["Iso3", null], ["StartDate", null], ["EndDate", null], ["Area", "ADM0_NAME"], ["Item Code", "Variable"], ["Item", "VariableDescription"], ["Year", null], ["Unit", null], ["Value", "Mean"]]}