Minor changes in the tutorial. A new section on the significance of LEC is added.
We are planning to update the execution algorithm. But we are still in the *planning* phase.
The problem: Currently each chart has a single activation event. But it may have two or more. So instead of dealing with the messy activation events, we are thinking of a different way. That is, we blindly activate all charts before executing an event. All the charts will evaluate silent constructs. Then the event to be executed will invalidate many inappropriate charts, and we move on.