2016 JBMO Problems/Problem 4
A table is called regular if each of its cells contains one of four pairwise distinct real numbers,such that each of them occurs exactly one in every subtable.The sum of all numbers of a regular table is called the total sum of the table.With any four numbers,one constructs all possible regular tables,computes their total sums and counts the distinct outcomes.Determine the maximum possible count.
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