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Help needed

Правка en2, от Bhosideke, 2020-10-27 07:34:43

Can anyone help me with this problem? I tried to think about it for 2 straight days but cannot up with a solution. Also the editorial doesn't make sense.

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en2 Английский Bhosideke 2020-10-27 07:34:43 39 Tiny change: ' solution.' -> ' solution. Also the editorial doesn't make sense.'
en1 Английский Bhosideke 2020-10-27 07:33:30 174 Initial revision (published)