*architecture-features* (variable)

                                 *implementation-features* (variable)

                                 *os-features* (variable)

                           first-architecture (function)

                        first-in-features (function)

                   *architecture-features* (variable)

                 *implementation-features* (variable)

                             *os-features* (variable)

                                 first-architecture (function)

                                 first-implementation (function)

                                 first-in-features (function)

                                 first-os (function)

                           first-implementation (function)

                                 implementation-specific-shorthand (function)

                           first-in-features (function)

                                 lisp-version-string (function)

                           first-os (function)

         implementation-specific-shorthand (function)

                  implementation-specific-shorthand (function)

                    lisp-version-string (function)

                            lisp-version-string (function)