fact: Definition predoublecategory_hor_sq_from_predoublecategory_sq_hor_ver_data (C : predoublecategory_sq_hor_ver_data) : predoublecategory_hor_sq := pr1 C.
imports: UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Notations UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence