This STUPID crossword took a hour. I have a headache.

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Across
  1. 3. Having one cell
  2. 6. One sided
  3. 7. To merge into one group
  4. 8. One group
  5. 9. One of a kind
Down
  1. 1. One direction
  2. 2. A one piece tutu and tights combination
  3. 4. A horse thing with a horn
  4. 5. A one wheeled bicycle
  5. 10. Together