Uni, Bi, and Tri Prefixes

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Across
  1. 1. Speaks two languages
  2. 2. Two-wheeled device
  3. 4. A three-book series
  4. 5. Every other year
  5. 8. A three-angled shape
  6. 9. Three-sport competition
Down
  1. 1. The crossing of two paths
  2. 3. 200 years
  3. 6. One-horned horse
  4. 7. A single eyebrow