Numbers

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123456789
Across
  1. 3. 1+5
  2. 4. 6+4
  3. 5. 2-1
  4. 7. 1-1
  5. 8. 2+3
  6. 9. 4-2
Down
  1. 1. 2+5
  2. 2. 3+6
  3. 4. 1+2
  4. 6. 10-2
  5. 8. 2+2