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0. Let s(w) denote the set of al the letters in w where w is an English word. Let us denote set equality, subset and union relations by =, ⊂ and ∪ respectively.Which of the following is NOT true?
s(ten) ⊂ s(twenty)
s(stored) = s(sorted)
s(sixty) ⊂ (s(six) ∪ s(twenty)
None of these
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