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Jan 20th, 2019
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  1. (make-graph) -> graph
  2. (make-node label) -> node
  3. (node-label node) -> label
  4. (add-node graph node) -> graph
  5. (add-edge graph from-node to-node) -> edge
  6. (edge-from edge) -> from-node
  7. (edge-to edge) -> to-node
  8. (graph-edges graph) -> {edge}
  9. (graph-nodes graph) -> {node}
  10. (graph-edges-from graph node) -> {edge}
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