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Apr 23 at 7:49 vote accept eldo
Apr 22 at 0:50 history edited azerbajdzan CC BY-SA 4.0
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Apr 21 at 18:14 history edited azerbajdzan CC BY-SA 4.0
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Apr 21 at 16:18 comment added azerbajdzan @eldo Yes, it needed quite some time.
Apr 21 at 15:14 comment added eldo I tried this without success for approx. 3 hours - it's very difficult to find your formula.
Apr 21 at 14:29 history answered azerbajdzan CC BY-SA 4.0