less { hop { filter_eq { all_rows ; men 's singles ; kasperi salo } ; year } ; hop { filter_eq { all_rows ; men 's singles ; ville lang } ; year } } = true
select the rows whose men s singles record fuzzily matches to kasperi salo . take the year record of this row . select the rows whose men s singles record fuzzily matches to ville lang . take the year record of this row . the first record is less than the second record .