group devisible rotable design
     
    
    group devisible incomplete block design ==> 分类不完全区组设计 group devisible rotable design ==> 分组旋转设计 group diffusion method ==> 分群扩散法,群扩散法 ..
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    短语
       
  
      可分组旋转设计
                          group divisible rotatable designs
                      ;
                  group divisible retable design