2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/78808We use a variation on the commutator collection process to characterize those pure braids which become trivial when any one strand is deleted, or, more generally, those pure braids which become trivial when all the strands in any one of a list of sets of strands is deleted.6 pages, 2 figuresGeometric TopologyGroup Theory20F36text