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Examples of  Z x (2 (Z – 1)) integer matrices where each row contains only the numbers {1, 2, …, 2 (Z – 1)} and each number n, 1 <= n < (Z – 1) (2 (Z – 1) + 1) appears exactly once from the partial sums of the rows. The row sum (Z – 1) (2 (Z – 1) + 1) appears Z times because there are Z rows in the matrix.

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