pcrt
qcrtp
rcrtpq
scrt
tcrtp
e3rtp
f3rtpq
g3rt
h3rtp
i3rtpq
3tstpq
4tst
5tstp
6tstpq
7tst
sktt
tkttp
ukttpq
vktt
wkttp
hbutp
ibutpq
jbut
kbutp
lbutpq