Four high school boys afflicted with spring fever skipped morning classes. After lunch they notified one teacher that a flat tire had caused them to miss her 1st period class.

Much to their relief she smiled and said, "Well, luckily you missed a test today so take seats apart from one another and take out a piece of paper."

Still smiling, she waited for them to sit down. Then she said, "First question: Which tire was flat?"

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