b2qrt
c2qrtb
d2qr
e2qrt
f2qrtb
0srrtb
1srr
2srrt
3srrtb
4srr
pjsr
qjsrt
rjsrtb
sjsr
tjsrt
eatrt
fatrtb
gatr
hatrt
iatrtb
30trtb
40tr
50trt
60trtb
70tr