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