f : Int @$\rightarrow$@ Int @$\rightarrow$@ Int
f a b c = (t a) + (t b) + (t c)
  where
    t x = x + x + x

f' : Int @$\rightarrow$@ Int @$\rightarrow$@ Int
f' a b c = (a + a + a) + (b + b + b) + (c + c + c)