Addition

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Across
  1. 4. 3+6
  2. 6. 1+2
  3. 8. 6+4
  4. 9. 4+8
Down
  1. 1. 2+5
  2. 2. 4+0
  3. 3. 2+3
  4. 5. 5+3
  5. 6. 1+1
  6. 7. 5+6