File:PSM V55 D502 Graph scale of animal learning curve 1.png
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![File:PSM V55 D502 Graph scale of animal learning curve 1.png](https://upload.wikimedia.org/wikipedia/commons/thumb/d/de/PSM_V55_D502_Graph_scale_of_animal_learning_curve_1.png/800px-PSM_V55_D502_Graph_scale_of_animal_learning_curve_1.png?20110601224400)
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