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Answers to extra work. 3. 222--Disphenoid. 4. 2/m2/m2/m--dipyramid. 5. 4/m—Tetragonal dipyramid. 6. 6mm hexagonal pyramid. Plotted on a mirror plane. 6. Dihexagonal pyramid. 7. 6/m-hexagonal dipyramid. 8. 23 tetrahedron 111 face. 8. 23—123 face.
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