nabrt
oabrtb
pabr
qabrt
rabrtb
c1brtb
d1br
e1brt
f1brtb
g1br
1rcr
2rcrt
3rcrtb
4rcr
5rcrt
qidrt
ridrtb
sidr
tidrt
uidrtb
f9drtb
g9dr
h9drt
i9drtb
j9dr