fact: Definition disp_cat_to_twosided_disp_cat_data (D : disp_cat (category_binproduct C₁ C₂)) : twosided_disp_cat_data C₁ C₂.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.PrecategoryBinProduct