Water transport - making a boat

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Across
  1. 2. Circles
  2. 4. Float
  3. 7. Place in
  4. 8. Cover
  5. 9. Keep out
  6. 11. Sort of wings
Down
  1. 1. Not together
  2. 3. Put in
  3. 5. Standing up
  4. 6. Strongly
  5. 10. Make
  6. 11. To make it double or into two
  7. 12. A flap of material