Kvant Math Problem 1319

Before I can write the complete solution, I need the full text of Kvant problem M1319.

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Problem

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

Before I can write the complete solution, I need the full text of Kvant problem M1319. Could you provide the problem statement, either as text or a description of the diagram? This is necessary to carry out the six-section, fully rigorous solution.