1. isProperSubstring on bitstrings of length ≤ 3
2. isProperSubsequence on bitstrings of length ≤ 3
3.Let ⊆ and ⊂ denote the subset and proper subset relations on P(Z). (That is, we have hA, Bi ∈ ⊂ if A ⊆ B but A 6= B.) What relation is represented by each of the following?
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