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Assuming that we have three functions f:AB g:BC and h:CD, which of the following is true in general. g(fh) is always well-defined. f(hg) is always

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Assuming that we have three functions f:AB g:BC and h:CD, which of the following is true in general. g(fh) is always well-defined. f(hg) is always well-defined. h(gf) is always well-defined. f(gh) is always well-defined

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