SSD(9, 3^16) and SSD(9, 3^12) via Theorems 6 and 7 (n=2, s=3, k=4) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 2 0 1 1 2 0 1 1 2 0 0 2 2 2 2 1 0 2 2 1 0 2 2 1 0 2 1 1 2 0 0 1 1 1 1 2 0 1 2 2 1 0 1 2 0 1 1 2 0 1 2 2 1 0 0 1 1 1 1 0 1 2 2 2 1 0 0 1 1 1 1 2 0 1 2 1 0 2 0 2 2 2 2 0 2 1 1 0 1 2 2 2 1 0 1 0 1 2 0 2 2 2 2 0 2 1 2 0 2 1 2 0 2 1 1 0 1 2 0 2 2 2 Notes: (i) SSD(9, 3^16) is a juxtaposition of 4 OA(9, 4, 3, 2) with overall A2=48. The possible projected A2 values are 0, 4/9 and 2/3 with frequencies 30, 54 and 36. (ii) Removing columns (1, 5, 9, 13) forms an SSD(9, 3^12) with overall A2=24. The possible projected A2 values are 0 and 4/9 with frequencies 12 and 54.