Initially, to perform a floating point addition, {HEAD ~ the mantissa} of {TAIL ~ the first operand} is assumed to be stored in both A register 10 and B register 11 by a previous operation 
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Initially , to perform a floating point addition , { HEAD ~ the mantissa } of { TAIL ~ the first operand } is assumed to be stored in both A register 10 and B register 11 by a previous operation
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH