大家好，我是大老李。这期节目是第二季的最后一期，本来我还有点愁这第二季结束语聊点啥呢，正好前几天,一位署名“上海实验中学中一班陈嘉熙”的听众，联系到我，说他听了我之前一期关于“[柯克曼女生散步](https://zhuanlan.zhihu.com/p/52564933)”问题的节目之后，自己有了点发现，让我给看看。这位陈同学的发现是有关可分解的不平衡区组设计的，简称RBIBD问题，具体含义请回听一下那期柯克曼女生散步问题。在那期节目最后我提到了，我收到另一个署名王本材的听众来信，说他在研究$(n^2,n,1)$这种类型的RBIBD问题。比如n取5的时候，这个问题就相当于问：有25个人，能否找出一种方案，每天每5个一组出去散步，每天5组，连续散步6天。最终6天后，每个人恰好和其他人一起散步一次？陈同学的思路：公众号: dalaoli_shuxue知乎专栏：https://zhuanlan.zhihu.com/dalaoli-shuxue
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