Graph / Finite State Machine Designer

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The big white box above is the FSM designer.  Here's how to use it:

• Add a state: double-click on the canvas
• Add an arrow: shift-drag on the canvas
• Move something: drag it around
• Delete something: click it and press the delete key (not the backspace key)

• Make accept state: double-click on an existing state
• Type numeric subscript: put an underscore before the number (like "S_0")
• Type greek letter: put a backslash before it (like "\beta")

This was made in HTML5 and JavaScript using the canvas element.