less { hop { filter_eq { all_rows ; metropolitan area ; new york , new york } ; since } ; hop { filter_eq { all_rows ; metropolitan area ; chicago , illinois } ; since } } = true
select the rows whose metropolitan area record fuzzily matches to new york , new york . take the since record of this row . select the rows whose metropolitan area record fuzzily matches to chicago , illinois . take the since record of this row . the first record is less than the second record .