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"It doesn't matter what you say" does not mean you can say anything. It just means you can use any routine. Opener is a routine that is in your head that you can use in your set. Obstacle interrupt is when an obstacle joins your set.
"It doesn't matter what you say" does not mean you can say anything. It just means you can use any routine. Opener is a routine that is in your head that you can use in your set. Obstacle interrupt is when an obstacle joins your set.