greater { hop { filter_eq { all_rows ; class ; dx } ; number in service } ; hop { filter_eq { all_rows ; class ; dsc } ; number in service } } = true
select the rows whose class record fuzzily matches to dx . take the number in service record of this row . select the rows whose class record fuzzily matches to dsc . take the number in service record of this row . the first record is greater than the second record .