less { hop { filter_eq { all_rows ; call sign ; ktaw } ; frequency mhz } ; hop { filter_eq { all_rows ; call sign ; ktml } ; frequency mhz } } = true
select the rows whose call sign record fuzzily matches to ktaw . take the frequency mhz record of this row . select the rows whose call sign record fuzzily matches to ktml . take the frequency mhz record of this row . the first record is less than the second record .