- addEdge
void addEdge(string a, string b)
 Undocumented in source. Be warned that the author may not have intended to support it.
- addNode
size_t addNode(string a)
 - topologicalSort
string[] topologicalSort()
 Undocumented in source. Be warned that the author may not have intended to support it.
This class is used only in utils/samheadermerger.d for merging reference sequence dictionaries, thus not much functionality is presented here.