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