less { hop { filter_eq { all_rows ; successor ; thomas tillinghast ( f ) } ; date successor seated } ; hop { filter_eq { all_rows ; successor ; robert waln ( f ) } ; date successor seated } } = true
select the rows whose successor record fuzzily matches to thomas tillinghast  f  . take the date successor seated record of this row . select the rows whose successor record fuzzily matches to robert waln  f  . take the date successor seated record of this row . the first record is less than the second record .