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971c1r a81c b81c1 c81c1r d81c

yy2c zy2c1 0y2c1r 1y2c 2y2c1

np3c1 op3c1r pp3c qp3c1 rp3c1r

cg4c1r dg4c eg4c1 fg4c1r gg4c