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Use "nonparticipants" in a sentence
"Specifically, the haunting prominence of one of the "nonparticipants" in the top graphic."
"For example, students in programs supported by The After-School Corporation (TASC) passed more Regents exams (New York State's high school exams) and earned more high school credits than nonparticipants, and had significantly higher school attendance after a year of participation."
"Automatically enrolling all nonparticipants every year."