and { only { filter_not_eq { all_rows ; engine ; 2.4 } } ; eq { hop { filter_not_eq { all_rows ; engine ; 2.4 } ; trim } ; xe ( 2007 - 08 ) } } = true
select the rows whose engine record is not equal to 2.4 . there is only one such row in the table . the trim record of this unqiue row is xe  2007  08  .