is the address of the whole tree, [4 5] [6 14 15].
DOT strict digraph rankdir=LR node [style=filled fillcolor=lightyellow penwidth=3 color=black fontname="Helvetica"] HERE NODE node [style=filled fillcolor=lightblue] WHERE /^Next/ LINKS HERE -> NODE node [style=filled fillcolor=white] HERE NODE WHERE /^Next/ LINKS HERE -> NODE node [style=filled fillcolor=white penwidth=3 color=black] LINKS HERE -> NODE node [style=filled fillcolor=white penwidth=1 color=black] HERE NODE LINKS HERE -> NODE node [style="filled,rounded,dotted" fillcolor=white] edge [style=dotted] HERE NODE BACKLINKS NODE -> HERE STATIC strict digraph {rankdir=LR node [style=filled fillcolor=lightyellow penwidth=3 color=black fontname="Helvetica"] "1" node [style=filled fillcolor=lightblue] node [style=filled fillcolor=white penwidth=3 color=black] "1" -> "2" "1" -> "3" node [style=filled fillcolor=white penwidth=1 color=black] "2" "2" -> "4" "2" -> "5" node [style=filled fillcolor=white penwidth=1 color=black] "3" "3" -> "6" "3" -> "7" node [style="filled,rounded,dotted" fillcolor=white] edge [style=dotted] "1" "Nock" -> "1"}