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Pos A C G T 0 4 0 13 0 1 5 0 12 0 2 15 0 2 0 3 0 17 0 0
[0 13 4 0 0 G A C T] [1 12 5 0 0 G A C T] [2 15 2 0 0 A G C T] [3 17 0 0 0 C A G T]