src/pycalendar/icalendar/recurrence.py [1083:1096]:
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        if (self.mByHours is not None) and (len(self.mByHours) != 0):
            items[:] = self.byHourExpand(items)

        if (self.mByMinutes is not None) and (len(self.mByMinutes) != 0):
            items[:] = self.byMinuteExpand(items)

        if (self.mBySeconds is not None) and (len(self.mBySeconds) != 0):
            items[:] = self.bySecondExpand(items)

        # Remove invalid items before BYSETPOS
        items[:] = filter(lambda x: not x.invalid(), items)

        if (self.mBySetPos is not None) and (len(self.mBySetPos) != 0):
            items[:] = self.bySetPosLimit(items)
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src/pycalendar/icalendar/recurrence.py [1213:1226]:
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        if (self.mByHours is not None) and (len(self.mByHours) != 0):
            items[:] = self.byHourExpand(items)

        if (self.mByMinutes is not None) and (len(self.mByMinutes) != 0):
            items[:] = self.byMinuteExpand(items)

        if (self.mBySeconds is not None) and (len(self.mBySeconds) != 0):
            items[:] = self.bySecondExpand(items)

        # Remove invalid items before BYSETPOS
        items[:] = filter(lambda x: not x.invalid(), items)

        if (self.mBySetPos is not None) and (len(self.mBySetPos) != 0):
            items[:] = self.bySetPosLimit(items)
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