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Let A = {1, {2, 3}, 4}. Here, A contains...

Let `A = {1, {2, 3}, 4}.` Here, A contains three elements, namely `1, {2,3}, 4.` Thus, `1 in A, {2,3} in A` and `4 in A.` But, `{2, 3} subeA` is a wrong statement in the context of this example, The correct statement is `{{2,3}} subeA.`

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