Research and design crossword puzzle

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Across
  1. 2. a quick drawing of a plan
  2. 3. carbon dioxide
  3. 5. a restriction
  4. 7. the first model
  5. 9. when shapes, colors or numbers are repeated
  6. 10. limits of variation on a object
Down
  1. 1. the study of air
  2. 4. 2 people racing each other on a short track
  3. 6. reduced air resistance
  4. 8. reduced size versions of pictures or videos