19 1 6 () 2 12 3 (1 , )6=18 4-5 18 6 (1 , )6=12 7 (1 , )6=18 () 8 8 9 (3,)3=15 () 10-20 15 21 (2,)3=12 1 6 () 2 12 () 3 (1 , )6=18() 4 (2 , )6=24 5 -6 24 7 ( 2, )6=18 1 5 2 -18 10
BFlash
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