A worksheet is dispensable.
All dispensable things are environment-friendly.  All woodware is dispensable. All paper is woodware.  No good things are bad.  All environment-friendly things are good. A worksheet is either paper or is environment-friendly.
∀x (Dispensable(x) → EnvironmentFriendly(x)) ∀x (Woodware(x) → Dispensable(x)) ∀x (Paper(x) → Woodware(x)) ∀x (Good(x) → ¬Bad(x)) ∀x (EnvironmentFriendly(x) → Good(x)) Paper(worksheet) ⊕ EnvironmentFriendly(worksheet)