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Characteristics of the participants with autism spectrum disorder.
| Characteristic described by a parent or specialist | Participant |
| Completely nonverbal: Cannot speak but understands spoken conversation | Participants 1, 2, 3, and 5 |
| Verbal: Can greet | Participant 4 |
| Nonverbal: Cannot speak a lot and only greets, but understands spoken conversation | Participants 6 and 7 |
