One, Two, Three, Four

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Across
  1. 2. to make four times as much
  2. 5. a group of three similar things
  3. 7. a geometric figure with four angles
  4. 10. an athletic contest usually involving swimming, running and biking
  5. 14. one
  6. 16. one wheeled vehicle propelled by pedals
  7. 17. one of the four equal parts
  8. 19. three
Down
  1. 1. four
  2. 2. plane figure with four sides and four angles
  3. 3. two
  4. 4. made up of two people, parts, or things
  5. 6. one
  6. 7. four
  7. 8. two
  8. 9. control by one person or one company
  9. 11. three cornered, three sided figure
  10. 12. two wheeled vehicle propelled by pedals
  11. 13. a set of three stories that are related by characters and plot
  12. 15. to cut into two pieces
  13. 16. a horse-like animal with one horn
  14. 18. to make one