{C : Type u_1} →
  [inst : CategoryTheory.Category.{v_1, u_1} C] →
    [inst_1 : CategoryTheory.Preadditive C] →
      {I₁ : Type u_2} →
        {I₂ : Type u_3} →
          {I₁₂ : Type u_4} →
            {c₁ : ComplexShape I₁} →
              {c₂ : ComplexShape I₂} →
                (K : HomologicalComplex₂ C c₁ c₂) →
                  (c₁₂ : ComplexShape I₁₂) →
                    [inst_2 : TotalComplexShape c₁ c₂ c₁₂] →
                      [DecidableEq I₁₂] →
                        [inst_4 : K.HasTotal c₁₂] →
                          (i₁₂ i₁₂' : I₁₂) →
                            K.toGradedObject.mapObj (c₁.π c₂ c₁₂) i₁₂ ⟶ K.toGradedObject.mapObj (c₁.π c₂ c₁₂) i₁₂'