Question

Determine whether the following is valid or invalid:

I finally discovered the mystery of why hard beds are good for you. Heres the story: If you have a hard bed, then you cannot stay comfortable for long periods, and when you cant stay comfortable for long periods, you roll around a lot. If you roll around a lot, then your joints dont ache from being in one position for too long. Therefore, if your joints ache in the morning from sleeping too long in one position, then you dont have a hard bed.

Answer

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