Danny's spelling crossword puzzle

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Across
  1. 4. something unusual, rare, or unique
  2. 7. a 3-wheeled vehicle propelled by pedals or a motor
  3. 8. a polygon of five angles and five sides
  4. 10. a polygon having three sides
  5. 12. a line of verse consisting of five metrical feet
  6. 13. having two focal lengths
  7. 14. a polygon of four sides
  8. 15. a vehicle that has a single wheel and is usually propelled by pedals
Down
  1. 1. a stool, table, or altar with three legs
  2. 2. a 4-sided enclosure especially when surrounded by buildings
  3. 3. a stationary exercise machine that resembles such a vehicle
  4. 5. occurring every two months
  5. 6. the greater extensor muscle of the front of the thigh that is divided into four parts
  6. 9. consistent in conduct or opinion
  7. 11. a talisman or magical object, typically disk-shaped and inscribed with a pentagram or other figure, and used as a symbol of the element of earth.