t1u2x
s1u2
r1u2xf
q1u2x
p1u2
4au2
3au2xf
2au2x
1au2
0au2xf
fkt2xf
ekt2x
dkt2
ckt2xf
bkt2x
qts2x
pts2
ots2xf
nts2x
mts2
12r2
02r2xf
z2r2x
y2r2
x2r2xf