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I don't understand the task

I read the description several times, but I don't understand why in an example the right answer is [1,8]. In my opinion the right answer is [5,11]. If I have pair of pipe numbers for cannonballs as [0,1] and pairs of working cannons as [4,5] or [11,0], then I need rotate the backend mechanism 5 or 11 times.

Created: Sept. 15, 2016, 1 p.m.
Updated: Feb. 26, 2020, 3:46 p.m.
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Oleg_Novikov