Set: pp::colors
  Set: pp::unicode
  Assumed: a
  Assumed: b
  Assumed: c
  Assumed: d
  Assumed: e
  Assumed: f
(f ∧ e) ∧ (d ∧ c) ∧ b ∧ a
====>
a ∧ b ∧ c ∧ d ∧ e ∧ f