====================================
	Error after type deriving/checking:
Context for Prelude.Num needed in left hand pattern at 21:13.
Context for Prelude.Num needed in left hand pattern at 20:13.
Context for Prelude.Num needed in left hand pattern at 19:13.
Context for Prelude.Num needed in left hand pattern at 18:13.
Context for Prelude.Num needed in left hand pattern at 17:13.