How to use
- Add a state: double-click on the canvas
- Add an arrow: shift-drag on the canvas
- Move something: drag it around
- Delete something: select it, press Delete or Cmd/Ctrl+⌫
- Make accept state: double-click an existing state
- Greek letter: backslash before the name (e.g. \beta)
- Subscript: underscore before a digit (e.g. S_0)
- Undo / Redo: Cmd/Ctrl+Z · Shift+Cmd/Ctrl+Z