# Packages
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# Functions
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NewLevelledForest initializes a LevelledForest.
VertexToString returns a string representation of the vertex.
# Structs
InvalidVertexError indicates that a proposed vertex is invalid for insertion to the forest.
LevelledForest contains multiple trees (which is a potentially disconnected planar graph).
VertexIterator is a stateful iterator for VertexList.
# Interfaces
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