"CW complex" . . . "cell structure" . "cell complexes" . "CW-decomposition" . "CW-complexes" . "cell complex" . "CW-complex" . . "skeleta" . "cellular decomposition" . "finite complex" . "homotopy category" . . "subcomplex" . "cell decomposition" . . "CW" . "CW structures" . "CW structure" . "CW complexes" . . . "2-cell" . . . . "map" . "CW complex" . .