less { hop { filter_eq { all_rows ; winning driver ; lee wallard } ; date } ; hop { filter_eq { all_rows ; winning driver ; alberto ascari } ; date } } = true
select the rows whose winning driver record fuzzily matches to lee wallard . take the date record of this row . select the rows whose winning driver record fuzzily matches to alberto ascari . take the date record of this row . the first record is less than the second record .