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Qc Qb Qa Dc= Qc⊕Qa Db = Qc Da = Qb Qc+ Qb+ Qa+
0 0 0 0 0 0 0 0 0
0 0 1 1 0 0 1 0 0
0 1 0 0 0 1 0 0 1
0 1 1 1 0 1 1 0 1
1 0 0 1 1 0 1 1 0
1 0 1 0 1 0 0 1 0
1 1 0 1 1 1 1 1 1
1 1 1 0 1 1 0 1 1

First Step ----------Second step--------------------------------third step

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