x1u2tn
w1u2t
v1u2
u1u2tn
t1u2t
8au2t
7au2
6au2tn
5au2t
4au2
jkt2
ikt2tn
hkt2t
gkt2
fkt2tn
uts2tn
tts2t
sts2
rts2tn
qts2t
52r2t
42r2
32r2tn
22r2t
12r2