and { only { filter_eq { all_rows ; result ; lost re - election republican gain } } ; eq { hop { filter_eq { all_rows ; result ; lost re - election republican gain } ; district } ; illinois 21 } } = true
select the rows whose result record fuzzily matches to lost re  election republican gain . there is only one such row in the table . the district record of this unqiue row is illinois 21 .