Task: Code to Text
Input (English): and { only { filter_not_eq { all_rows ; central bank ; bank } } ; eq { hop { filter_not_eq { all_rows ; central bank ; bank } ; currency } ; us dollar ( usd ) } } = true
Output (English): select the rows whose central bank record does not match to bank . there is only one such row in the table . the currency record of this unqiue row is us dollar  usd  .