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> (a + b + c + d) * e

   a
   |> add(b)
   |> add(c)
   |> add(d)
   |> mult(e)
> mult(add(a, add(b, add(c, d))), e)

    c
    |> add(d)
    |> add(b, _)
    |> add(a, _)
    |> mult(e)
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mult(add(a, b, c, d), e)

:)

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Hence I said that operators are more readable for longer formulas.
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