This package implements binary trees of various kinds, presenting a uniform interface to them all. Reading package.lisp should give you an idea of what sorts of things you can do to trees and reading binary-trees.lisp and generics.lisp provides a slightly more in-depth look at the functions you would want to use. There is a moderately extensive test suite which one can run with (ASDF:OOS 'ASDF:TEST-OP :TREES). Please be aware that it does take a bit of time to run. If any tests fail, you have found a bug; please report it. Report any bugs, comments, or improvements to <froydnj@gmail.com>. Nathan Froyd 18 March 2008