Task: Text to Code
Input (English): select the rows whose erp w record is equal to 27 . there is only one such row in the table . the call sign record of this unqiue row is w230aa .
Output (English): and { only { filter_eq { all_rows ; erp w ; 27 } } ; eq { hop { filter_eq { all_rows ; erp w ; 27 } ; call sign } ; w230aa } }