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Let $Z_2=\{0,1\}$, $Z_2^r=Z_2\times Z_2 \times...\times Z_2,$ $S_1\subset Z_2^{n_1}$ and $S_2\subset Z_2^{n_2}$, $S=(S_2,S_1)\subset Z_2^{n_1+n_2}$, I'd like to construct $S_1$ and $S_2$ s.t the ...