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Sunburn logic

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If you are fair-skinned, you will sunburn.
If you sunburn, you will not go to the dance.
If you do not go to the dance, your parents will want to
know why you didn't go to the dance.
Your parents do not want to know why you didn't go to the dance.
Therefore, you are not fair-skinned.

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Sunburn logic is embedded.

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The logic is all wrong. There are three statements that say that if something happened, somethign else would happen.

If you are fair-skinned, you will sunburn.
If you sunburn, you will not go to the dance.
If you do not go to the dance, your parents will want to know why you didn't go to the dance.

These are givens, so they don't need to be proven. However, an interesting characteristic of them is that ...

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