Explain the ML type for each of the following declarations: a. fun a(x,y) = x+2*y; b. fun b(x,y) = x+y/2.0; c. fun c(f) = fn y => f(y); d. fun d(f,x) = f(f(x))); e. fun e(x,y,b) = if b(y) then x else y;

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