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Planar graph
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===Upward planar graphs=== An [[Upward planar drawing|upward planar graph]] is a [[directed acyclic graph]] that can be drawn in the plane with its edges as non-crossing curves that are consistently oriented in an upward direction. Not every planar directed acyclic graph is upward planar, and it is [[NP-complete]] to test whether a given graph is upward planar.
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