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Similar situation. The book does delineate between certain activities and how they're reinforced/guided- so I'm not sure your example is a counter-example. It actually fits the narrative of the book quite well. For example, it uses Futsol as an example of a sport that is self-reinforcing: you do the right things, you keep the ball and get a goal- if not, it gets taken from you. In contrast, a student playing the piano is much more successful with an experienced teacher to guide the rights and wrongs.