a |
a-b |
b |
a-b |
a |
a-b |
b |
b-a |
x2 |
x2-y2 |
y2 |
x2-y2 |
a |
a-b |
b |
a-b |
a-b |
a-b |
a |
a-b |
b |
b-a |
a |
a-b |
b |
a-b |
a-b |
a-b |
x2 |
x2-y2 |
y2 |
x2-y2 |
x2-y2 |
x2-y2 |
a |
a2-b2 |
b |
a2-b2 |
x+2 |
x+1 |
x+1 |
x+2 |
a2-1 |
a+2 |
1-a |
a+2 |
x+2y |
1-x2 |
y-1 |
x2-1 |
y |
1-x2 |
y |
y2-x2 |
1 |
y+x |
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