less { hop { filter_eq { all_rows ; call sign ; wjds } ; frequency mhz } ; hop { filter_eq { all_rows ; call sign ; w298as } ; frequency mhz } } = true
select the rows whose call sign record fuzzily matches to wjds . take the frequency mhz record of this row . select the rows whose call sign record fuzzily matches to w298as . take the frequency mhz record of this row . the first record is less than the second record .