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curriculum, and topological sorting achieve four to achieve courses topological sorting. (Excerpts) (Canada) Problem Description : software professional students to study a series of courses Some of the programs must, in its prevocational courses can be completed after the study, the specific relationship between the table below : Course No. 295 C1 prerequisite for the design process without foundation Discrete Mathematics C1 C2 C3 data structure C1, C2 C1 C4 C5 assembly language operating system C3 assumes that each course of study for a semester, test students for the professional design of the teaching plan,