UMB Scheme comes with ABSOLUTELY NO WARRANTY. This is free software and
you are free to redistribute it under certain conditions.
See the UMB Scheme Release Notes for details. Type Control-d to exit.

Loading /usr/lib/umb-scheme/prelude.scheme...
Loading /usr/lib/umb-scheme/SLIB-for-umb-scheme.init...
Loading /usr/lib/umb-scheme/slib/require.scm...

==> (load "blocks")
Loading blocks...
Loading graphblocks...

()
==> (load "graphblocksUMB")
Loading graphblocksUMB...

()
==> (graph initial)


   a     
   b     
   c     
   -----

()
==> (graph goal)


       a 
       b 
       c 
   -----

()
==> (graph '((a d) (g s t q r) () (u v x z) () (f r)))


     g         
     s   u  GCing... 582224 bytes collected, 217760 bytes used, heapsize 800000 bytes.
   
     t   v     
   a q   x   f 
   d r   z   r 
   -----

()
==> (graph '((a d) (g s t q r) () (u v x z) () (f r)))


     g         
     s   u     
     t   v     
   a q   x   f 
   d r   z   r 
   -----

()
==>