∀ {β : Type u_2} {δ : Type u_4} {X : δ → Type u_6} [inst : (a : δ) → MeasurableSpace (X a)] {g : (a : δ) → β → X a}
  (a : δ), MeasurableSpace.comap (g a) inferInstance ≤ MeasurableSpace.comap (fun b c => g c b) MeasurableSpace.pi