∀ {ι : Type u_1} {κ : Type u_2} [inst : Preorder ι] {c : ℤ → ComplexShape κ} {r₀ : ℤ}
  (data : CategoryTheory.Abelian.SpectralObject.SpectralSequenceDataCore ι c r₀) (r r' : ℤ) (hrr' : r + 1 = r')
  (hr : r₀ ≤ r) (pq' : κ) (i₀' i₀ i₁ : ι), i₀' = data.i₀ r' pq' ⋯ → i₀ = data.i₀ r pq' ⋯ → i₁ = data.i₁ pq' → i₀' ≤ i₁