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In sum_water_refractor you should use len instead of lambda x: len(x). There is no point in using a lambda if you don't change anything (number or value of parameters).
In sum_water_refractor you should use len instead of lambda x: len(x).
In sum_water_refractor you should use len instead of lambda x: len(x). There is no point in using a lambda if you don't change anything (number or value of parameters).
