pln2
qln2p
rln2pu
sln2
tln2p
eco2p
fco2pu
gco2
hco2p
ico2pu
32o2pu
42o2
52o2p
62o2pu
72o2
stp2
ttp2p
utp2pu
vtp2
wtp2p
hkq2p
ikq2pu
jkq2
kkq2p
lkq2pu