Task: Code to Text
Input (English): and { only { filter_eq { all_rows ; silver ; 4 } } ; eq { hop { filter_eq { all_rows ; silver ; 4 } ; nation } ; pakistan ( pak ) } } = true
Output (English): select the rows whose silver record is equal to 4 . there is only one such row in the table . the nation record of this unqiue row is pakistan  pak  .