fact: Definition ver_sq_bicat : UU := ∑ (B : bicat), twosided_disp_cat_data B B.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.Bicategories.Core.Bicat