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MB 1 5 . 3 . 2 1 : - X = { 1 , { 1 } , { 1 , 2 }

MB15
".3.21: -
X ={1,{1},{1,2},2,{3},4}?
()
{1,2} X
()
{2,4} X
()
{2,4} in X
()
{2,3} X
()
{2,3} in X
()
|X|=7"

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