oct/pent words

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Across
  1. 2. five carbon atoms in a molecule
  2. 3. a kid
  3. 4. a series of 8 notes (in music).
  4. 5. a 2D shape with 8 angles and sides.
  5. 7. A contest featuring five events
  6. 9. A shape with five faces
  7. 10. a 3D object with 8 flat faces.
  8. 12. Five years or group of five
Down
  1. 1. of the year.
  2. 2. five fingers
  3. 6. A regular five
  4. 8. star polygon
  5. 10. a sea creature with 8 tentacles.
  6. 11. (originally) the 8th