q
q
qq
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
a
a
a
s
s
s
d
d
s
s
s
s
s
s
s
s
s
s
s
ss
s
s
s
ss
