[PostScript]
AC (\circ, T): trait
  introduces __ \circ __: T, T -> T
  asserts forall x, y, z: T
    (x \circ y) \circ z == x \circ (y \circ z);
    x \circ y == y \circ x
  implies
    Associative,
    Commutative (T for Range)
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