{HEAD ~ The device} for converting series of A input data elements to {TAIL ~ series} of A output data elements comprises a memory means for containing these series of input and output data elements 
{ HEAD ~ The device } for converting series of A input data elements to { TAIL ~ series } of A output data elements comprises a memory means for containing these series of input and output data elements
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH