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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 _handleSealvlPressRemark(self, d):
 """ Parse the sea-level pressure remark group. """

        value = float(d['press']) / 10.0
        if value < 50:
            value += 1000
        else:
            value += 900
        if not self.press:
            self.press = CustomPressure(value)
        self.press_sea_level = CustomPressure(value)