a-3-p, b-1-r, C-4-Q, d-2-sa-3-p,b-2-r,c-4-q,d-1-sa-3-r , b-1-p, c - 4 - q, d - 2 - s a - 3-p, b - 1 -r, c-4-s, d-2-q
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