( , ) =
1 2 2 2 3 4 4 6
2 ( − , ) + 2 ( − , ) ∑( ) − 4 ∑( ) + 6 ∑( ) +
=1 =1 =1
4
2
2 2
∑ + 6 ∑ ( + ) + 7 ∑
2 2 2
2
5
≠ ≠ , ≠ ≠ ≠
1 7 1 4
, ( , ) = 0 , ( , ) =
1 or − 1 5
7
( )
( )
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