What are the fundamental groups of the following spaces? X3 = {(x; y; z) ∈ R^3 | (x; y; z) ̸= (0; 0; 0)} X4 = R^3 \ {(x; y; z) | x = 0 , y = 0 , 0 <= z <= 1} X5 = R^3 \ {(x; y; z) | x = 0 , 0 <= y <= 1}
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