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Further , the results suggest well-documented effects of aggregate economic variables on maltreatment are likely overstated if one fails to control for relevant local policy variables . In summary , append-to-buffer works as follows : it saves the value of the current buffer in the variable called oldbuf . Hence , the process of unification can informally be described as that of finding appropriate values for variables in order to make the two terms the same . These degradation experiments have been conducted at different sediment-water ratios and at different temperatures in order to evaluate the effect of these variables on degradation rates .