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/sum^n_{x=0}
!(x)=\{0~~if~~0=x,1~~if~~0\ne x\}
!(x)=\{0~~if 0=x,1~if~~0\ne x\}
!(x)=\{0~if 0=x,1~if~0\ne x\}
1000_2>>3_10~\&~0001_2