Options and Futures    A brief note on topology    Cube
                      g            h  
                        +------------+
                        |\           |\
                        | \ a        | \ b
                        |  +------------+
                        |  |         |  |
                      f |  |       e |  |
                        +--|---------+  |
                         \ |          \ |
                          \| d         \| c
                           +------------+
This cube architecture connects eight nodes.  Every node is connected to three other ones (in the x, y, and z dimension).  Starting from any one node, I can reach one in 0 hops (the one I started with, let's say a), three others in 1 hop (b, g, d), three more in the 2nd hop (h, f, c), and the remaining eigth node in a 3rd hop (e); taking 1 1/2 hops to reach any node on average, and 3 in the worst case.