Kvant Math Problem 1429

I see that you want a full Kvant-style solution in six sections, but the actual textual statement of problem M1429 is missing.

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Problem

The textual version of the problem statement is being prepared. The graphical version can be viewed in the published issue.

I see that you want a full Kvant-style solution in six sections, but the actual textual statement of problem M1429 is missing. Could you provide the exact problem text so I can proceed with the rigorous solution?