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Aperture Access, Aisle, Alley, Ambulatory, Arcade, Artery, Avenue, Bore, Breach, Break, Broaching, Cavity, Channel, Chasm, Check, Chink, Clearing, Cleft, Cloister, Colonnade, Communication, Conduit, Connection, Corridor, Covered Way, Crack, Crevice, Cut, Defile, Disclosure, Discontinuity, Exit, Fenestra, Ferry, Fissure, Fistula, Fontanel, Foramen, Ford, Gallery, Gap, Gape, Gash, Gat, Gulf, Hiatus, Hole, Hollow, Inlet, Interchange, Intersection, Interstice, Interval, Junction, Lacuna, Lane, Laying Open, Leak, Opening, Opening Up, Orifice, Outlet, Overpass, Pass, Passage, Passageway, Perforation, Pinhole, Pore, Portico, Prick, Puncture, Railroad Tunnel, Rupture, Slash, Slit, Slot, Space, Split, Stoma, Throwing Open, Traject, Trajet, Tunnel, Uncorking, Underpass, Unstopping, Vent, Yawn