less { hop { filter_eq { all_rows ; chassis ; brm p201 } ; year } ; hop { filter_eq { all_rows ; chassis ; hill gh1 } ; year } } = true
select the rows whose chassis record fuzzily matches to brm p201 . take the year record of this row . select the rows whose chassis record fuzzily matches to hill gh1 . take the year record of this row . the first record is less than the second record .