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export PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/path/to/graphviz/bin"

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import graphviz
dot = graphviz.Digraph(comment='The Round Table')
dot.node('A', 'King Arthur')
dot.node('B', 'Sir Bedevere the Wise')
dot.node('L', 'Sir Lancelot the Brave')
dot.edges(['AB', 'AL'])
dot.edge('B', 'L', constraint='false', label='B to L')
dot.render('test-output/round-table.gv', view=True)

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