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If a 1 2 3 4
If a 1 2 3 4 pictures 5
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If a 1 2 3 4
if a 1 2 3 4 find 2a
if a 1 2 3 4 then find a square
if a 1 2 3 4 find a inverse
if a 1 2 3 4 5 then the number of proper subsets of a is
