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  1. 1. = 1
  2. 2. = 2
  3. 3. = 3
  4. 4. = 4
  5. 5. = 5
  6. 6. + = 1 + 1 = 2
  7. 7. 1 + 1 = 2
  8. 8. + = = 1 + 2 = 3
  9. 9. 1 + 2 = 3

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