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PROTRUSION, EXTENSION, INDENT, CAVITY, SOCKET, GROOVE, FLANGE, TONGUE, VALLEY, CORNER, DIMPLE, RECESS, BLANK, NOTCH, BULGE, CLASP, LATCH, RIDGE, CURVE, ANGLE, POINT, SPIKE, WING, SLOT, LOCK, STUD, BUMP, HOOK, EDGE, STEM, TAB, KEY, RIB