QOPTN
C
WT
n
QQC
QQC
WPP
n
QOC
SSC
WQO
n
PPC
TTC
WQW
n
VC
UQC
XPO
cl\
UC
UWC
XPX
c
PWC
WUC
XRO
n
QOC
POUC
POT
n
QPC
PQTC