return vmap, replacements
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def compile_graph_key(key_items, nodes_above=[], elisions=None,
prefix='key_', width=2):
"""Generate a dot file snippet that acts as a legend for a graph.
vertices = [vmap[x] for x in vertices]
edges = [(vmap[a], vmap[b]) for a, b in edges]
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vlen = max(6, max(len(v) for v in vertices))
# first, the key for the columns