returns invisibly for each subtree a list with the following
components:
- \item{tip.label}
- \item{node.label}
- \item{Ntip}
- \item{Nnode}
+ \item{tip.label}{}
+ \item{node.label}{}
+ \item{Ntip}{}
+ \item{Nnode}{}
}
\examples{
### Random tree with 12 leaves