Confusion Method(cont’d)

• S0(x)=S(x)?1, S1(x)=S(x)?3, S2(x)=S(x?1), S3(x)=S(x?3)

• S0(S2(x))=S2(S0(x))=x, S1(S3(x))=S3(S1(x))=x

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