and { only { filter_eq { all_rows ; team ; 499cc matchless g50 } } ; eq { hop { filter_eq { all_rows ; team ; 499cc matchless g50 } ; rider } ; mark herbertson } } = true
select the rows whose team record fuzzily matches to 499cc matchless g50 . there is only one such row in the table . the rider record of this unqiue row is mark herbertson .