digraph {
concentrate=true;overlap=scale;"rat=Matryoshka" [label="rat\nMatryoshka",shape=box,style=filled,color=deepskyblue];"rat=Matryoshka" -> "tool=Matryoshka" [label="similar",dir="both"];"tool=Matryoshka" [label="tool\nMatryoshka",shape=box,style=filled,color=deepskyblue];}