| http://www.w3.org/ns/prov#value | - The exclusive-or block 21 takes the 8 bit output W from the substitution device 20 and the output Y from the multiplexer 24 and performs an exclusive-or operation producing in turn an output Z. This output is in turn fed into either the bottom edge or the left edge of the array, depending again on whether a row or column shifting operation is being performed in a given instance.
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