(1) Find continuous functions f1, f2, f3, f4 defined on the open unit interval I = (i.e. functions fi: (0, 1) → R) such that • f1(I) = (L1, M₁) • ƒ2(I) = (L2, M2] • f3(I) = [L3, M3) • ƒ4(I) = [L4, M4] for some real numbers Li, Mi. (0, 1)

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