R6DS                    R6DS: provides reference classes implementing
                        some useful data stuctures.
RBST                    The RBST reference class
RDLL                    The RDLL reference class
RDeque                  The RDeque reference class
RDict                   The RDict reference class
RQueue                  The RQueue reference class
RSet                    The RSet reference class
RStack                  The RStack reference class
version                 Show the version number of some information.
