This is from a note I found
I don't understand why t cannot equal to 3? If we choose first three columns, each row appears three times, for example, (0,0,0) appears three times in the subarray, which exactly matches the critera which is "any N × t subarray has each t-tuple appearing as a row anequal number of times."?
2026-03-28 06:30:26.1774679426
Orthogonal arrays
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