Sam's y crosswords

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Across
  1. 2. in maths
  2. 5. to sing a song
  3. 8. something odd
  4. 10. with three wheel
  5. 12. in egypt
Down
  1. 1. to get strong
  2. 3. a country
  3. 4. used in maths
  4. 6. something in a cave
  5. 7. unusal
  6. 9. how gravity works
  7. 11. unbroken