Finite State Automaton with CAs
 
   - It's pretty easy to see how CAs can be used to
       implement a Finite State Automata.
 
   - A simple way is that there are CAs for each state, and
       the currently active CA is the current state.
 
   - There are also CAs to categorise input.
 
   - When one of those becomes active, they cause a transition
       to a new state.
 
   - The neurons for both the current state and the input need to
       be active for the new state to ignite.
 
   - There is backward suppression so that the old state is
       extinguished.
 
   - We also used  variable binding 
       via short term potentiation to do stacks.