lists class hierarchy, 2012-06

                Any
                 |
               Cool
                 |
  +-----------------------------+
  |                             |
Parcel                       Iterable
                                |
              +------------------------------+
              |                              |
             List                         Iterator
              |                              |
           +------+            +----------------------------+
           |      |            |        |         |         |
         Array   LoL       ListIter  MapIter  GatherIter  Range