zg="a"
yh="b"
xi="c"
wj="d"
vk="e"
ul="f"
tm="g"
sn="h"
ro="i"
qp="j"
pq="k"
or="l"
ns="m"
mt="n"
lu=""
kv="o"
jw="p"
ix="q"
hy="r"
gz="s"
fg="t"
ef="u"
de="v"
cd="w"
cf="x"
ch="y"
ck="z"
