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2( ) 2( ) 2 ( ) 2 =12
3( ) 3( ) 3 ( ) 3 =12
4( ) 4( ) 4 ( ) 4 = 15
6 ( ) 6 ( ) 6 ( ) 6 = 1
2 ( ) 9 ( ) 8 ( ) 3 =6
8 ( ) 2 ( ) 6 ( ) 20 =2