Question: Write an ML (SML; Standard Meta Language) High-order function philter(f,x,L) that takes a function f and an element x and returns the list of all

Write an ML (SML; Standard Meta Language) High-order function philter(f,x,L) that takes a function f and an element x and returns the list of all those elements y on list L such that f(x,y) = true.

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