拉丁方阵(Latin Square):拉丁方阵中的横贯线(Transversals)：思考题：请你构造一个4阶的拉丁方阵，其中没有横贯线。2个拉丁方阵组成正交拉丁方阵，即希腊拉丁方：10阶的希腊拉丁方，推翻了欧拉的猜想：3个4阶拉丁方组成的正交拉丁方：汉字数独：请你在以上数独中填入不同的汉字，使得每一行、每一列、每个九宫格内，以下所有偏旁和部首都各出现1次：偏旁：木字旁、三点水、竖心旁、单人旁、草字头、提手旁、反犬旁、月字旁、土字旁；部首：同、各、令、且、句、青、亢、包、里。喜马拉雅FM：https://www.ximalaya.com/keji/6310606/ （欢迎加入Ximi团）微信关注：dalaoli_shuxue B站: https://space.bilibili.com/423722633 知乎：https://zhuanlan.zhihu.com/dalaoli-shuxue/
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