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  1. If you have lost weight, then you exercised.

  2. If you exercise, then you will lose weight.

  3. If you are American, then you are patriotic.

  4. If you are patriotic, then you are American.

  5. If a number is rational, then it is real.

  6. If a number is not even, then it is prime. (Or the contrapositive: if a number is not prime, then it is even.)

  7. If the Broncos don't win the Super Bowl, then they didn't play in the Super Bowl. Alternatively, if the Broncos play in the Super Bowl, then they will win the Super Bowl.

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