3 |
2 |
1 |
2 |
3 |
2 |
1 |
2 |
4 |
3 |
1 |
3 |
4 |
3 |
1 |
3 |
5 |
4 |
1 |
4 |
5 |
4 |
1 |
4 |
n+1 |
n |
n+1 |
n |
n+1 |
n |
(n+1)n |
n |
n+1+n2+n |
n |
n2+2n+1 |
n |
(n+1)2 |
n |
n+1 |
n |
n+1 |
n |
1 |
a |
1 |
b |
4 |
a+b |
a |
b |
b |
a |
x2+x |
x2+2x+1 |
1 |
2 |
a |
(a+1)2 |
1 |
(a+1)2 |
x+y |
z |
x+z |
y |
y+z |
x |
(x+y)(y+z)(z+x) |
xyz |
2a |
a+1 |
2 |
a+1 |
pq |
2r |
2p |
r2 |
1 |
2q |
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