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erdos_567_H5

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**Erdős Problem 567 (H5)** Is $H_5$ ($C_5$ with two vertex-disjoint chords) Ramsey size linear?

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Lean 4 Statement 
theorem erdos_567_H5 : answer(sorry) ↔ IsRamseySizeLinear H5
ID: ErdosProblems__567__erdos_567_H5
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