ILL 1967 Problem 51
A subset of the set of integers 0 - 99 is said to have property if it is impossible to fill a crossword-puzzle with 2 rows and 2 columns with numbers in (0 is written as 00, 1 as 01, and so on). Determine the maximal number of elements in the set with the property
Dataset text AoPS wiki problems. Quoted with source.
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