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1. A = {tiger, lion, puma, cheetah, leopard, cougar, ocelot} (this is a set of large species of cats)
2. A = {a, b, c, ..., z} (this is a set consisting of the lowercase letters of the alphabet)
3.A = {-1, -2, -3, ...} (this is a set of the negative numbers)
0 0 0
complete set empty set subsets
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