Table 1.

The current number of RNA tree topologies, divided into existing and yet unreported, the latter subdivided into RNA-like and non-RNA-like by PAM and a supervised clustering algorithm (k-NN) based on existing RNA

V, vertex no.	Existing	RNA-like		Non-RNA-like		Total
		PAM	k-NN	PAM	k-NN
2	1	0	0	0	0	1
3	1	0	0	0	0	1
4	2	0	0	0	0	2
5	3	0	0	0	0	3
6	6	0	0	0	0	6
7	9	2	2	0	0	11
8	15	3	5	5	3	23
9	11	22	32	14	4	47
10	10	60	87	36	9	106
Total	58	87	126	55	16	200