draw specific levels of a hierarchy only

After obtaining a nested blockModel with state=minimize_blockmodel_dl(...), I
can use draw_hierarchy(state...) to view the hierarchical block partition
with a radial layout. However, the lowest level in the hierarchy has too
many groups...is there a way to view the blocks at a higher level in the
hierarchy? Thanks.

state.get_bstack() extracts the graph at any level....

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