A.49 library(ugraphs): Unweighted Graphs
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Availability::- use_module(library(ugraphs)).(can be autoloaded)
Sourcetop_sort(+Graph, -Sort0, -Sort)
Generate the difference list Sort-Sort0 as a topological sorting of Graph, if one is possible.
ClioPatria (version V3.1.1-40-g9d9e003)