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The integers in set {11, 15, 19} are pairwise relatively prime.( )

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The integers in set {14, 15, 21} are pairwise relatively prime.( )

The integers in set {12, 17, 31, 37} are pairwise relatively prime.( )

The integers in set {7, 8, 9, 11} are pairwise relatively prime.( )

The great common divisor of 123 and 277 is ______ 。

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