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\sqrt{x}
\sum
1000_2~\&~0010_2~=~0000_2~=~false
1000_2~\&\&~0010_2~=~(0\ne1000_2)\&\&(0\ne0010_2)~=~true
1000_2 \& 0010_2 = 0000_2 = false