y1pr
z1prr
01prrl
11pr
21prr
nsqrr
osqrrl
psqr
qsqrr
rsqrrl
cjrrrl
djrr
ejrrr
fjrrrl
gjrr
19rr
29rrr
39rrrl
49rr
59rrr
q0srr
r0srrl
s0sr
t0srr
u0srrl