关键词: 搭配, 二部图, 匹配, 单元, 广义匹配

Abstract: Three most elementary types of questions on Crews Grouping are put forward for discussion in this paper.Although rudimentary do they seem,they are gates leading to a series of deeper,harder,and more complex problems.Based on the basic problems explored,a kind of thinking is established in order to reduce the original problems into what have been resolved or what are comparatively easier to resolve

Key words: grouping, bigraph, matching