#NEXUS

BEGIN NETWORKS;

Network tree1 = ((1,4,2));
Network tree2 = ((1,2),(4,3));

END;

BEGIN SO;

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fja



END;

BEGIN PHYLONET;

SymmetricDifference tree1 tree2;

END;
===

===


Error at [22,27]: Taxon '3' in network 'tree2' does not appear in the network 'tree1'.