less { hop { filter_eq { all_rows ; chassis ; hesketh 308e } ; year } ; hop { filter_eq { all_rows ; chassis ; surtees ts19 } ; year } } = true
select the rows whose chassis record fuzzily matches to hesketh 308e . take the year record of this row . select the rows whose chassis record fuzzily matches to surtees ts19 . take the year record of this row . the first record is less than the second record .