"P(S)=" { {1},{2},{3},{1,2},{2,3},{1,3},{1,2,3},"\\empty" }
"O(" order of a set ")" "="number of element at that set.
Elements of set "P(S)" are set in itself.
"O(" {1}")=" 1, "O(" {2}")=2" ,"O(" {3}")=" 3,"O(" {1,2}")=" 2, "O(" {2,3}")=2"
"O(" {1,3}")=" 2 ,"O(" {1,2,3}")=" 3 , "O(\\empty )=" 0.
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