2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/162111A contractible simplicial complex is constructed that parametrizes different ways of representing a fixed one-dimensional homology class in a closed orientable surface by isotopy classes of systems of disjoint oriented simple closed curves. This is a variant on an earlier construction of Bestvina-Bux-Margalit.7 pagesGeometric Topology57M25text