<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def plot_segmentlistdict(self, segmentlistdict, y=None, dy=1, **kwargs):
 """Plot a `~gwpy.segments.SegmentListDict` onto these axes Parameters segmentlistdict : `~gwpy.segments.SegmentListDict` (name, `~gwpy.segments.SegmentList`) dict y : `float`, optional starting y-axis value for new segmentlists **kwargs any other keyword arguments acceptable for `~matplotlib.patches.Rectangle` Returns ------- collections : `list` list of `~matplotlib.patches.PatchCollection` sets for each segmentlist """

        if y is None:
            y = self.get_next_y()
        collections = []
        for name, segmentlist in segmentlistdict.items():
            collections.append(self.plot_segmentlist(segmentlist, y=y,
                                                     label=name, **kwargs))
            y += dy
        return collections