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:
| category   | indicator                               | indicator_friendly                                  | type_data   |   latitude |   longitude |   region_id | country_id   | name                   |   year |   value |
|:-----------|:----------------------------------------|:----------------------------------------------------|:------------|-----------:|------------:|------------:|:-------------|:-----------------------|-------:|--------:|
| Population | population                              | Total population                                    | 1000        |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   1990 | 4364    |
| Population | avg_annual_rate_change_percentage_urban | Average annual rate of change of population – Urban | p           |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   1955 |    3.26 |
| Population | avg_annual_rate_change_percentage_urban | Average annual rate of change of population – Urban | p           |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   2045 |    0.23 |
| Population | avg_annual_rate_change_percentage_urban | Average annual rate of change of population – Urban | p           |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   2015 |    0.33 |
| Population | population                              | Total population                                    | 1000        |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   2040 | 9124    |
| Population | population                              | Total population                                    | 1000        |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   2020 | 7656    |
| Population | population                              | Total population                                    | 1000        |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   1960 | 1349    |
| Population | population                              | Total population                                    | 1000        |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   2035 | 8785    |
| Population | population                              | Total population                                    | 1000        |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   1995 | 4833    |
| Population | avg_annual_rate_change_percentage_urban | Average annual rate of change of population – Urban | p           |         25 |          17 |         189 | LY           | Libyan arab jamahiriya |   1965 |    7.78 |

TableB:
| category      | indicator                                | indicator_friendly                                                             | type_data   |   latitude |   longitude |   region_id | country_id   | name                     |   year |     value |
|:--------------|:-----------------------------------------|:-------------------------------------------------------------------------------|:------------|-----------:|------------:|------------:|:-------------|:-------------------------|-------:|----------:|
| Population    | number_of_cities_1_5_million             | Number of cities by country – 1 to 5 million inhabitants                       | n           |    7       |     21      |         289 | CF           | Central african republic |   2005 |     43    |
| Population    | infant_mortality_rate                    | Infant Mortality rate (Deaths per 1000 live births)                            | n           |    7       |     21      |         289 | CF           | Central african republic |   1995 |    123.04 |
| Slum dwellers | slum_proportion_living_urban             | Percentage of slum population in urban area                                    | p           |    7       |     21      |         289 | CF           | Central african republic |   2000 |     91.9  |
| Population    | population_estimate_urban_agglomerations | Population estimate of urban agglomeration                                     | n           |    4.36664 |     18.5583 |         289 | CF           | Bangui                   |   2013 | 792000    |
| Population    | number_of_cities_500k_1_million          | Number of cities by country – 500 000 to 1 million inhabitants                 | n           |    7       |     21      |         289 | CF           | Central african republic |   2000 |     39    |
| Education     | net_enrolment_rate_slum                  | Net enrolment rate in primary education in urban and rural areas (Male) – Slum | p           |    7       |     21      |         289 | CF           | Central african republic |   1994 |     72.8  |
| Population    | urban_population_countries               | Urban population – Countries                                                   | 1000        |    7       |     21      |         289 | CF           | Central african republic |   2007 |   1665    |
| Population    | avg_annual_rate_change_percentage_total  | Average annual rate of change of population – Total                            | p           |    7       |     21      |         289 | CF           | Central african republic |   1995 |      2.27 |
| Population    | avg_annual_rate_change_percentage_total  | Average annual rate of change of population – Total                            | p           |    7       |     21      |         289 | CF           | Central african republic |   1955 |      1.61 |
| Population    | population_cities_by_country_10m_or_more | Population in cities by country – cities with 10 million or more inhabitants   | 1000        |    7       |     21      |         289 | CF           | Central african republic |   2020 |  42460    |



source_headers: category
indicator
indicator_friendly
type_data
latitude
longitude
region_id
country_id
name
year
value
target_headers: category
indicator
indicator_friendly
type_data
latitude
longitude
region_id
country_id
name
year
value
column_mappings: category
category
indicator
indicator
indicator_friendly
indicator_friendly
type_data
type_data
latitude
latitude
longitude
longitude
region_id
region_id
country_id
country_id
name
name
year
year
value
value
output: {"column_mappings": [["category", "category"], ["indicator", "indicator"], ["indicator_friendly", "indicator_friendly"], ["type_data", "type_data"], ["latitude", "latitude"], ["longitude", "longitude"], ["region_id", "region_id"], ["country_id", "country_id"], ["name", "name"], ["year", "year"], ["value", "value"]]}