Question: Again, each light doubles as a button. Pressing it toggles its own light, as well as all of its neighbours. Which buttons do you have

Again, each light doubles as a button. Pressing it toggles its own light, as well as all of its neighbours. Which
buttons do you have to press to turn off all the light from the starting position show above? Is the answer
unique? Is every pattern of lights reachable from this starting position?
Again, each light doubles as a button. Pressing

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