k_max:4
tree input info:
parents, children, lengths:
0 1 0.03978
0 2 0.09623
1 4 0.10702
1 5 0.08708
2 6 0.0298
2 3 0.02039
3 7 0.00705
3 8 0.00377
mapping from leave labels to sequence id is:
4 4
5 3
6 2
7 0
8 1