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'x + y' and 'y + x' are equivalent.
'(x + y) * (x - y)' and 'x^2 + y^2' are not equivalent.
'(x + y) * (x - y)' and 'x^2 - y^2' are equivalent.
Electric eels were invented at the same time as electricity
Before electricity was invented, electric eels had to stun with gas
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