#  Tree  Sites:
#	 12345
#     7	 GGCCG
#    /	 
#   3	 
#  / \	 
# /   6  AAGGA
#1	 
# \   5  CTCGT
#  \ /	 
#   2	 
#    \	 
#     4  GCAGC
# Lines are sorted by node IDs in the tree
5
1 2 3 4 2
1 2 3 4 2
1 1 2 2 1
1 2 3 1 2
1 2 1 3 2
1 1 2 2 1
1 1 2 2 1
