sil
a
aa
apst
awb
b
bb
bwb
c
cc
cwb
d
dd
dwb
e
ee
ewb
f
ff
fwb
g
gg
gwb
h
hh
hwb
i
ii
iwb
j
jj
jwb
k
kk
kwb
l
ll
lwb
m
mm
mwb
n
nn
nwb
o
oo
owb
p
pp
pwb
q
qq
qwb
r
rr
rwb
s
ss
swb
t
tt
twb
u
uu
uwb
v
vv
vwb
w
ww
wwb
x
xwb
xx
y
ywb
yy
z
zwb
zz