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1,1,2,6,15,() A.21;B.24;C.31;D.40;
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:1,2,6,15,31,()A.46 B.61 C.66 D.56
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0,1/2,8/11,5/6,8/9,() A.31/34 B.33/36 C.35/38 D.37/40
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0,1/2,8/11,5/6,8/9,()A.31/34 B.33/36 C.35/38 D.37/40
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1,2,6,15,31,() A.46B.61C.66D.56
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1,2,6,15,31,()A.46 B.61 C.66 D.56
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0,2,6,14,(),62。A.40B.36C.30 D.38