and { only { filter_less { all_rows ; gdp per capita ( us ) ; 16000 } } ; eq { hop { filter_less { all_rows ; gdp per capita ( us ) ; 16000 } ; member countries } ; finland } } = true
select the rows whose gdp per capita  us  record is less than 16000 . there is only one such row in the table . the member countries record of this unqiue row is finland .