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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def step_next(self):
 """Go to the next step."""

        window_start = around(self.parent.value('window_start') +
                              self.parent.value('window_length') /
                              self.parent.value('window_step'), 2)

        self.parent.overview.update_position(window_start)