Pumpkin Circle!

Logic Level 2

Seven jack-o'-lanterns are arranged in a circle. When a jack-o'-lantern is touched, the candles in that jack-o'-lantern and its left and right neighbors will change states: each will light if it was unlit or will be extinguished if it was lit.

If they all are lit, what is the fewest number of touches you need to make to extinguish all the jack-o'-lanterns?

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