File:PSM V58 D529 Experiments with habit formation in turtles.png
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![File:PSM V58 D529 Experiments with habit formation in turtles.png](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d2/PSM_V58_D529_Experiments_with_habit_formation_in_turtles.png/799px-PSM_V58_D529_Experiments_with_habit_formation_in_turtles.png?20161229002648)
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