Round V E F V - E + F
(a) 8 12 6 2
(b) 8 13 7 2
(c) 8 14 8 2
(d) 8 15 9 2
(e) 8 16 10 2
(f) 8 16 11 2

I think that 8+16-11 doesn't equal to 2
so that part is a bit confusing.

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