p
p
b
a
x0
x1
p
x2
x3
p
p
x3
a
x2
p
b
a
x1
b
x0
2.2
p
p
b
a
x0
x1
p
x2
x3
p
x3
a
x2
p
p
b
a
x0
x1
p
x2
x3
p
b
a
x1
b
x0
p
p
b
a
x0
x1
p
x2
x3
p
p
x3
a
x2
p
b
a
x1
b
x0
true
p
p
b
a
x0
x1
p
x2
x3
p
p
x3
a
x2
p
b
a
x1
b
x0
true
Failed!
NaTT
certifiable-1.6