MIT Scheme 7.7.90.+

From the MIT Scheme web page:

Scheme is a statically scoped and properly tail-recursive dialect of the Lisp programming language invented by Guy Lewis Steele Jr. and Gerald Jay Sussman. It was designed to have an exceptionally clear and simple semantics and few different ways to form expressions. A wide variety of programming paradigms, including imperative, functional, and message passing styles, find convenient expression in Scheme.

MIT/GNU Scheme is a complete programming environment that runs on many unix platforms, as well as Microsoft Windows and IBM OS/2. It features a rich runtime library, a powerful source-level debugger, a native-code compiler, and an integrated Emacs-like editor.

To reproduce my results on Ubuntu Gutsy Gibbon, install MIT Scheme with

sudo apt-get install mit-scheme

and run the interpreter with


MIT Scheme makes the following choices: