UndirectedEdge["_:_", "1:_"]
UndirectedEdge["_:_", "_:1"]
UndirectedEdge["_:_", "4:_"]
UndirectedEdge["_:_", "_:4"]
UndirectedEdge["1:_", "1:1"]
UndirectedEdge["1:_", "1:4"]
UndirectedEdge["_:1", "1:1"]
UndirectedEdge["_:1", "4:1"]
UndirectedEdge["4:_", "4:4"]
UndirectedEdge["4:_", "4:1"]
UndirectedEdge["_:4", "4:4"]
UndirectedEdge["_:4", "1:4"]
UndirectedEdge["1:1", "1:1,4"]
UndirectedEdge["1:1", "1,4:1"]
UndirectedEdge["4:4", "4:1,4"]
UndirectedEdge["4:4", "1,4:4"]
UndirectedEdge["1:4", "1:1,4"]
UndirectedEdge["1:4", "1,4:4"]
UndirectedEdge["4:1", "1,4:1"]
UndirectedEdge["4:1", "4:1,4"]
UndirectedEdge["1:1,4", "1,4:1,4"]
UndirectedEdge["1,4:1", "1,4:1,4"]
UndirectedEdge["4:1,4", "1,4:1,4"]
UndirectedEdge["1,4:4", "1,4:1,4"]