f
x1
n
c
n
a
x1
c
f
x1
f
n
a
c
x1
n
a
x1
c
x1
c
c
x1
c
x1
n
s
x1
f
s
s
x1
n
f
x1
f
n
x1
2.2
c
f
x1
n
a
c
x1
n
s
x1
f
s
s
x1
f
x1
c
n
a
x1
n
a
x1
c
x1
f
x1
n
a
x1
n
f
x1
n
x1
c
f
x1
c
x1
c
f
x1
f
n
a
c
x1
f
x1
n
c
n
a
x1
n
f
x1
f
n
x1
true
n
f
x1
f
n
x1
f
x1
n
c
n
a
x1
c
f
x1
f
n
a
c
x1
c
f
x1
c
x1
f
x1
c
n
a
x1
n
s
x1
f
s
s
x1
n
f
x1
n
x1
f
x1
n
a
x1
n
a
x1
c
x1
c
f
x1
n
a
c
x1
true
a
1
0
s
1
1
n
1
1
0
c
1
0
f
1
1
0
f
1
0
c
1
0
n
1
1
0
c
f
x1
n
a
c
x1
n
a
x1
c
x1
f
x1
n
a
x1
n
f
x1
n
x1
f
x1
c
n
a
x1
c
f
x1
c
x1
c
f
x1
f
n
a
c
x1
f
x1
n
c
n
a
x1
n
f
x1
f
n
x1
c
c
x1
c
x1
f
x1
n
c
n
a
x1
n
a
x1
c
x1
n
s
x1
f
s
s
x1
n
f
x1
f
n
x1
c
f
x1
f
n
a
c
x1
f
x1
n
a
x1
f
x1
c
n
a
x1
f
x1
n
c
n
a
x1
n
a
x1
c
x1
n
f
x1
n
x1
n
f
x1
f
n
x1
c
f
x1
c
x1
c
f
x1
n
a
c
x1
c
f
x1
f
n
a
c
x1
true
2
1
a
1
0
0
0
1
1
0
0
s
1
0
0
0
1
1
5604
1
n
1
1
1
0
1
1
0
0
c
1
0
0
0
1
1
0
0
f
1
1
0
3
f
1
0
0
1
0
1
2
0
c
1
0
0
1
0
1
0
0
n
1
1
0
1
0
1
1
0
c
c
x1
c
x1
f
x1
n
c
n
a
x1
n
a
x1
c
x1
n
s
x1
f
s
s
x1
n
f
x1
f
n
x1
c
f
x1
f
n
a
c
x1
NaTT
certifiable-1.6