A collection of unordered lists used to represent a finite graph.1 Each unordered list describes the set of neighbours of a node in the graph.
Examples

This graph can be represented by three unordered lists: {b, c}, {a, c}, {a, b}.
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A collection of unordered lists used to represent a finite graph.1 Each unordered list describes the set of neighbours of a node in the graph.

This graph can be represented by three unordered lists: {b, c}, {a, c}, {a, b}.