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