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It's actually a spectrum of disorders, a spectrum that ranges, for instance, from Justin, a 13-year-old boy who's not verbal, who can't speak, who communicates by using an iPad to touch pictures to communicate his thoughts and his concerns, a little boy who, when he gets upset, will start rocking, and eventually, when he's disturbed enough, will bang his head to the point that he can actually cut it open and require stitches.