Let A = {x | x is a real number and 0<x<1}, B = {x | x is a real number and x2 + 1 = 0}, C = {x | x = 4m, m Z}, D = {(x, 3) | x is an English word whose length is 3}, and E = {x | x Z and x2 ≤ 100}. Identify each set as finite, countable, or uncountable.
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