multiple:forest.nw
simple:newtree.nw
I:-I newtree.nw
L:-L newtree.nw
LI:-LI newtree.nw
bI:-bI newtree.nw
bL:-bL newtree.nw
bIL:-bIL newtree.nw
rootedge: edged_root.nw 
