fact: Definition twosided_disp_cat_to_disp_cat_data (D : twosided_disp_cat C₁ C₂) : disp_cat_data (category_binproduct C₁ C₂).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.PrecategoryBinProduct