French crossword puzzle

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12345678
Across
  1. 5. 20-10
  2. 7. 20-1
  3. 8. 3+4
Down
  1. 1. 20-18
  2. 2. 10-4
  3. 3. 4+4
  4. 4. 3+1
  5. 5. 4+6+2
  6. 6. 1+0