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(a). C 4 / a m m with origin at -42m. |
(b). C 4 / a m m with origin at 2/m and 4mm at 1/4,0,z. |
(c). C 4 / a m m with origin at 2/m and -42m at 1/4,0,0. |
(d). C 4 / a m m with origin at 4mm and 2/m at 1/4,0,0. |