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Merge remote branch 'hello/master'
Merge pull request #40 from lucknessbuaa/master

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Merge pull request #41 from lucknessbuaa/master

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Merge remote branch 'hello/master'
Merge pull request #42 from lucknessbuaa/master

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Merge pull request #43 from lucknessbuaa/master

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Merge remote branch 'hello/master'
Merge pull request #44 from lucknessbuaa/master

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Merge pull request #45 from lucknessbuaa/master

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