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:
| Country Name   | Country ISO3   |   Year | Indicator Name                                                | Indicator Code    |        Value |
|:---------------|:---------------|-------:|:--------------------------------------------------------------|:------------------|-------------:|
| Belarus        | BLR            |   1999 | Interest payments (current LCU)                               | GC.XPN.INTP.CN    |  1.93251e+06 |
| Belarus        | BLR            |   2008 | Customs and other import duties (% of tax revenue)            | GC.TAX.IMPT.ZS    |  7.49153     |
| Belarus        | BLR            |   2014 | Expense (% of GDP)                                            | GC.XPN.TOTL.GD.ZS | 27.4104      |
| Belarus        | BLR            |   1992 | Taxes on exports (% of tax revenue)                           | GC.TAX.EXPT.ZS    |  5.29101     |
| Belarus        | BLR            |   2002 | Other expense (% of expense)                                  | GC.XPN.OTHR.ZS    |  2.99496     |
| Belarus        | BLR            |   2000 | Revenue, excluding grants (current LCU)                       | GC.REV.XGRT.CN    |  2.61969e+08 |
| Belarus        | BLR            |   2019 | Tax revenue (% of GDP)                                        | GC.TAX.TOTL.GD.ZS | 13.3015      |
| Belarus        | BLR            |   2016 | Other taxes (% of revenue)                                    | GC.TAX.OTHR.RV.ZS |  0.452629    |
| Belarus        | BLR            |   2009 | Subsidies and other transfers (current LCU)                   | GC.XPN.TRFT.CN    |  3.14464e+09 |
| Belarus        | BLR            |   1996 | Taxes on income, profits and capital gains (% of total taxes) | GC.TAX.YPKG.ZS    | 12.5417      |

TableB:
| Country Name   | Country ISO3   |   Year | Indicator Name                                                            | Indicator Code    |            Value |
|:---------------|:---------------|-------:|:--------------------------------------------------------------------------|:------------------|-----------------:|
| Belarus        | BLR            |   1999 | Patent applications, residents                                            | IP.PAT.RESD       |    993           |
| Belarus        | BLR            |   2010 | Research and development expenditure (% of GDP)                           | GB.XPD.RSDV.GD.ZS |      0.66913     |
| Belarus        | BLR            |   2014 | Research and development expenditure (% of GDP)                           | GB.XPD.RSDV.GD.ZS |      0.50548     |
| Belarus        | BLR            |   1995 | Patent applications, nonresidents                                         | IP.PAT.NRES       |    415           |
| Belarus        | BLR            |   2010 | Scientific and technical journal articles                                 | IP.JRN.ARTC.SC    |   1061.94        |
| Belarus        | BLR            |   2000 | Charges for the use of intellectual property, payments (BoP, current US$) | BM.GSR.ROYL.CD    |      2.7e+06     |
| Belarus        | BLR            |   1999 | Charges for the use of intellectual property, receipts (BoP, current US$) | BX.GSR.ROYL.CD    | 700000           |
| Belarus        | BLR            |   2021 | Charges for the use of intellectual property, receipts (BoP, current US$) | BX.GSR.ROYL.CD    |      1.34696e+08 |
| Belarus        | BLR            |   2013 | Research and development expenditure (% of GDP)                           | GB.XPD.RSDV.GD.ZS |      0.65191     |
| Belarus        | BLR            |   2009 | Charges for the use of intellectual property, payments (BoP, current US$) | BM.GSR.ROYL.CD    |      7.6e+07     |



source_headers: Country Name
Country ISO3
Year
Indicator Name
Indicator Code
Value
target_headers: Country Name
Country ISO3
Year
Indicator Name
Indicator Code
Value
column_mappings: Country Name
Country Name
Country ISO3
Country ISO3
Year
Year
Indicator Name
Indicator Name
Indicator Code
Indicator Code
Value
Value
output: {"column_mappings": [["Country Name", "Country Name"], ["Country ISO3", "Country ISO3"], ["Year", "Year"], ["Indicator Name", "Indicator Name"], ["Indicator Code", "Indicator Code"], ["Value", "Value"]]}