z1sbc y1sb x1sbc2 w1sbc v1sb

absb 9asbc2 8asbc 7asb 6asbc2

lkrbc2 kkrbc jkrb ikrbc2 hkrbc

wtqbc vtqb utqbc2 ttqbc stqb

72pb 62pbc2 52pbc 42pb 32pbc2