3 000 [shape="none"label="000", pos="10.5,10!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
4 001 [shape="none"label="001", pos="11.7320508076,11!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
5 010 [shape="none", label="010", pos="12.5,10!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
6 011 [shape="none", label="011", pos="13.7320508076,11!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
7 100 [shape="none", label="100", pos="10.5,8!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
8 101 [shape="none", label="101", pos="11.7320508076,9!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
9 110 [shape="none", label="110", pos="12.5,8!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
10 111 [shape="none", label="111", pos="13.7320508076,9!",fontsize=20,fixedsize=true,width=0.5,height=0.3];
11 000:sw -> 000:nw [arrowhead="vee"];
12 010 -> 001 [arrowhead="vee"];
13 100 -> 001 [arrowhead="vee"];
14 110 -> 001 [arrowhead="vee"];
15 001 -> 101 [arrowhead="vee"];
16 101 -> 111 [arrowhead="vee"];
17 111 -> 011 [arrowhead="vee"];
18 011 -> 101 [arrowhead="vee"];