qsrvx
psrv
osrvxy
nsrvx
msrv
11qv
01qvxy
z1qvx
y1qv
x1qvxy
cbqvxy
bbqvx
abqv
9aqvxy
8aqvx
nkpvx
mkpv
lkpvxy
kkpvx
jkpv
ytov
xtovxy
wtovx
vtov
utovxy