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:
| INDICATOR_ID       | COUNTRY_ID   |   YEAR | TYPE                | METADATA                                                                                                                                 |
|:-------------------|:-------------|-------:|:--------------------|:-----------------------------------------------------------------------------------------------------------------------------------------|
| NARA.AGM1.RUR.Q3.F | TUR          |   2014 | Source:Data sources | Value suppressed (less than 25 unweighted observations in sample).                                                                       |
| MATH.PRIMARY.LPIA  | TUR          |   2011 | Source:Data sources | Trends in International Mathematics and Science Study (TIMSS). Students achieving at least Intermediate International Benchmark. Grade 4 |
| NARA.AGM1.RUR.Q2.F | TUR          |   2004 | Source:Data sources | Not available (no data for children aged one year before official primary entry age).                                                    |
| ROFST.H.1.URB.Q2.F | TUR          |   2014 | Source:Data sources | Turkey DHS 2013. The survey collected data on school attendance for age 4-24 and educational attainment for age 4 and above.             |
| CR.2.WPIA          | TUR          |   2008 | Source:Data sources | Turkey DHS 2008. World Inequality Database on Education (WIDE), June 2019.                                                               |
| CR.2.F.WPIA        | TUR          |   2004 | Source:Data sources | Turkey DHS 2003-04. The survey collected data on school attendance for age 6-24 and educational attainment for age 6 and above.          |
| CR.1.RUR.Q4.M      | TUR          |   2014 | Source:Data sources | Value suppressed (less than 25 unweighted observations in sample).                                                                       |
| CR.1.RUR.Q5.M      | TUR          |   2014 | Source:Data sources | Turkey DHS 2013. The survey collected data on school attendance for age 4-24 and educational attainment for age 4 and above.             |
| CR.1.Q4            | TUR          |   2004 | Source:Data sources | Turkey DHS 2003-04. The survey collected data on school attendance for age 6-24 and educational attainment for age 6 and above.          |
| GAR.5T8.RUR.Q1.F   | TUR          |   2004 | Source:Data sources | Turkey DHS 2003-04. The survey collected data on school attendance for age 6-24 and educational attainment for age 6 and above.          |

TableB:
| Country Name   | Country ISO3   |   Year | Indicator Name                                                                             | Indicator Code               |     Value |
|:---------------|:---------------|-------:|:-------------------------------------------------------------------------------------------|:-----------------------------|----------:|
| Turkey         | TUR            |   2004 | Population receiving 3 programs (%)                                                        | per_numprog3_pop_tot         |  0.3971   |
| Turkey         | TUR            |   2019 | Average per capita transfer held by 2nd quintile - All Social Assistance (preT)            | per_sa_allsa.avt_q2_preT_tot |  0.819064 |
| Turkey         | TUR            |   2005 | Coverage in extreme poor (<$1.9 a day) (%) - All Social Insurance  (preT)                  | per_si_allsi.cov_ep_preT_tot | 31.9024   |
| Turkey         | TUR            |   2006 | Average per capita transfer held by 1st quintile (poorest) - All Social Insurance          | per_si_allsi.avt_q1_tot      |  2.65847  |
| Turkey         | TUR            |   2004 | Average per capita transfer held by 3rd quintile - International Private Transfers -urban  | per_pr_ip.avt_q3_urb         |  2.85825  |
| Turkey         | TUR            |   2008 | Adequacy of benefits in 5th quintile (richest) (%) -All Social Protection and Labor -rural | per_allsp.adq_q5_rur         | 33.8286   |
| Turkey         | TUR            |   2008 | Average per capita transfer held by 5th quintile (richest) - Social Pensions -urban        | per_sa_sp.avt_q5_urb         |  1.70698  |
| Turkey         | TUR            |   2005 | Average per capita transfer held by 5th quintile (richest) - Cash Transfer -rural          | per_sa_ct.avt_q5_rur         |  0.299683 |
| Turkey         | TUR            |   2004 | Coverage in 4th quintile (%) - Social Pensions -urban                                      | per_sa_sp.cov_q4_urb         |  0.483951 |
| Turkey         | TUR            |   2005 | Poverty Headcount reduction (%) -  Social Pension - 1st quintile (poorest) -urban          | per_sa_sp_p0_urb             |  0.607773 |



source_headers: INDICATOR_ID
COUNTRY_ID
YEAR
target_headers: Indicator Code
Country ISO3
Year
column_mappings: INDICATOR_ID
Indicator Code
COUNTRY_ID
Country ISO3
YEAR
Year
output: {"column_mappings": [["INDICATOR_ID", "Indicator Code"], ["COUNTRY_ID", "Country ISO3"], ["YEAR", "Year"], ["TYPE", null], ["METADATA", null]]}