less { hop { filter_eq { all_rows ; name ; portland } ; date of commission } ; hop { filter_eq { all_rows ; name ; st albans } ; date of commission } } = true
select the rows whose name record fuzzily matches to portland . take the date of commission record of this row . select the rows whose name record fuzzily matches to st albans . take the date of commission record of this row . the first record is less than the second record .