 as a wrapper around the actual
   array and as a queue.  The string arrays are particularly useful
   for both parsing and composing text.  Generic lists with
   doubly-linked cons cells are also provided.  Other data structures
   are provided for handling ordered sets and maps, as well as hash sets
   and hash maps.

14. Examples of programs that are easily built using the library:

    - for plotting x-y data, we give a programmatic interface
      to the gnuplot program, with output to X11, png, ps or 