less { hop { filter_eq { all_rows ; year ; 1986 } ; position } ; hop { filter_eq { all_rows ; year ; 1987 } ; position } } = true
select the rows whose year record fuzzily matches to 1986 . take the position record of this row . select the rows whose year record fuzzily matches to 1987 . take the position record of this row . the first record is less than the second record .