Gene counts for node-list (15 genes)															Age and # nodes (n)
500	700	0	0	0	0	0	100	58	350	0	675	10	509	0	Young (n = 8)
502	704	0	1	2	3	0	95	59	375	0	450	0	458	0	Young (n = 10)
600	690	0	1	0	5	0	110	65	378	2	567	9	450	0	Old (n = 11)
595	721	0	0	0	9	0	100	0	300	0	604	0	425	0	Old (n = 7)

Let edge-list be: (1-3), (3-7), (5-8), (8-9), (9-12), (10-14).