SSD(16, 4^9) via Theorem 4 (n=2, s=4) 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 2 2 2 2 2 2 2 2 0 3 3 3 3 3 3 3 3 1 0 1 2 3 1 0 3 2 1 1 0 3 2 0 1 2 3 1 2 3 0 1 3 2 1 0 1 3 2 1 0 2 3 0 1 2 0 2 3 1 3 1 0 2 2 1 3 2 0 2 0 1 3 2 2 0 1 3 1 3 2 0 2 3 1 0 2 0 2 3 1 3 0 3 1 2 2 1 3 0 3 1 2 0 3 3 0 2 1 3 2 1 3 0 0 3 1 2 3 3 0 2 1 1 2 0 3 Note: The overall A2 value is 12; the possible projected A2 values are 0 and 1 with frequencies 24 and 12. The first column is orthogonal to all other columns.