htd21 gtd2 ftd21o etd21 dtd2
s2c2 r2c21o q2c21 p2c2 o2c21o
3bc21o 2bc21 1bc2 0bc21o zbc21
elb21 dlb2 clb21o blb21 alb2
pua2 oua21o nua21 mua2 lua21o