Can someone help with this problem("Uzastopni", COCI contest 1 year: 2015/2016)

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Can someone help with this problem("Uzastopni", COCI contest 1 year: 2015/2016)

Difference between ru5 and ru6, changed 4 character(s)

I can not understand this part(↵
↵
![ ](/predownloaded/1b/37/1b379e07f4135934cec6692b598c0ea8c61b1e05.png)

Revisions

Rev.	By	When	Δ	Comment
ru8	Nurss	2021-05-30 11:31:48	25	Мелкая правка: 'ful^_^\n\n![ ](/' -> 'ful^_^\n\nUPD: I got it now\n\n![ ](/'
ru7	Nurss	2021-05-29 22:29:32	53
ru6	Nurss	2021-05-29 22:27:01	4
ru5	Nurss	2021-05-29 22:26:22	113	Мелкая правка: '![ ](/pred' -> 'I cant understand this part\n\n![ ](/pred'
ru4	Nurss	2021-05-29 22:25:51	70
ru3	Nurss	2021-05-29 22:25:07	76
ru2	Nurss	2021-05-29 22:24:04	1	Мелкая правка: 'нимок.PNG")' -> 'нимок.PNG">)'
ru1	Nurss	2021-05-29 22:23:39	59	Первая редакция (опубликовано)