and { only { filter_eq { all_rows ; chassis ; ferrari 156 aero } } ; eq { hop { filter_eq { all_rows ; chassis ; ferrari 156 aero } ; year } ; 1964 } } = true
select the rows whose chassis record fuzzily matches to ferrari 156 aero . there is only one such row in the table . the year record of this unqiue row is 1964 .