test this

1234567891011121314151617181920
Across
  1. 3. FOUR
  2. 5. LINEAR
  3. 8. PLANAR
  4. 11. THREE
  5. 12. OCTAHEDRAL
  6. 14. AXIS
  7. 17. PERPENDICULAR
  8. 18. NO
  9. 19. PYRAMIDAL
  10. 20. FALSE
Down
  1. 1. CIRCLE
  2. 2. CO
  3. 4. HORIZONTAL
  4. 6. PRINCIPAL
  5. 7. TETRAHEDRAL
  6. 9. FIVE
  7. 10. SECONDARY
  8. 13. DIHEDRAL
  9. 15. IDENTITY
  10. 16. PLANE