Options for planarizing a graph. Used as a parameter by the 'planarize' method. Two are the possible options: DO_NOT_PRESERVE_EMBEDDING leaves the planarization step the freedom of changing the order of edges around nodes; PRESERVE_EMBEDDING forbids the "planarize" method to change such order. Other planarization vincula, referring to smaller parts of the graph and not to the whole graph, are handled by means of constraints.

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