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3a 3b 3c<br />

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= − (−γ) = γ<br />

d e f<br />

g h i<br />

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a b c <br />

a b c <br />

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4g 4h 4i<br />

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d e f<br />

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a b c<br />

d e f<br />

g h i<br />

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2y y − z − x 2y<br />

2z 2z z − x − y<br />

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x + y + z x + y + z x + y + z<br />

2y y − z − x 2y<br />

2z 2z z − x − y<br />

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59

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