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6 7 1′ 7 6 )

7 1′ 2′ 1′ 2′ ) all x2

5 6 7 6 5 )

6 7 1′ 7 6 )

 

 

6 1′ 6 )

7 1′ 2′ 1′ 2′ ) all x4

5 7 5 )

6 7 1′ 7 6 )