t1s2r
s1s2
r1s2rk
q1s2r
p1s2
4as2
3as2rk
2as2r
1as2
0as2rk
fkr2rk
ekr2r
dkr2
ckr2rk
bkr2r
qtq2r
ptq2
otq2rk
ntq2r
mtq2
12p2
02p2rk
z2p2r
y2p2
x2p2rk