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A pollster was assigned to stand in the mall at entrance A and approach every 100th person coming into the mall to ask a few questions on a survey for the mall management. While counting the people who passed by, he ignored everyone who had blond hair. Identify the one piece of information that might be a source of bias.

User Mydoglixu
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The ignoring of blond-haired people is a bias.
User Yingjie
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