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Question related to mission Break Rings

I would like to give some feedback about ...

In the extra check the given ring combination is:


I tried to draw this combination on the paper to realize the situation. I cant understand how it is possible to break rings in 5 steps to get them all lose. I think the answer should be 6:

first break ring number 5, then no.2, 3 and you got combination of ({8, 4}, {1, 7}, {9, 6}) which requires a removal of 3 rings. So total steps must be 6.