Task: Code to Text
Input (English): and { only { filter_eq { all_rows ; erp w ; 8 } } ; eq { hop { filter_eq { all_rows ; erp w ; 8 } ; call sign } ; k251ah } } = true
Output (English): select the rows whose erp w record is equal to 8 . there is only one such row in the table . the call sign record of this unqiue row is k251ah .