prefix dct:    <http://purl.org/dc/terms/>

SELECT DISTINCT ?country_in_year ?year ?country ?entrant
WHERE {
    ?countries_in_esc_by_year skos:broader dbc:Countries_in_the_Eurovision_Song_Contest_by_year.

    ?country_in_year dct:subject ?countries_in_esc_by_year.
    bind( REPLACE(str(?country_in_year), ".*(\\d{4})", "$1") as ?year).
    FILTER ( xsd:integer(?year) < 2020).

    ?country_in_year dbp:country ?country.

    ?country_in_year dbp:entrant ?entrant
      FILTER (isLITERAL(?entrant)).

    ?country_in_year dbp:song ?song.
    
}
ORDER BY ASC(?countries_in_esc_by_year)