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In the last decade, the use of bicycle helmets has increased tremendously, particularly among young children. Although bicycle helmets appear to be as sturdy and safe as football helmets, they are exempt from the safety standards the government has imposed upon the manufacture of football helmets. As a result, a child involved in a bicycle accident is more likely to suffer a serious head injury than is a child injured in a football game.
The argument depends upon which one of the following assumptions: