"key","name","value"
"push_subgraph","cluster.1",""
"node","node.1",""
"edge","->",""
"node","node.2",""
"pop_subgraph","cluster.1",""
"key","name","value"
"push_subgraph","cluster.1",""
"node","node.1",""
"edge","->",""
"node","node.2",""
"pop_subgraph","cluster.1",""