<commit_before>TODO List
1. payment sequence diagram
2. discount rule match sequence diagram
3. auto generate checkout activity diagram   ***OK***
4. Log in sequence diagram   ***OK***
5. Discout rule management sequence diagram  ***OK***<commit_msg>modified:   Doc/requirement.markdown<commit_after>TODO List
1. payment sequence diagram
2. discount rule match sequence diagram    ***OK***
3. auto generate checkout activity diagram   ***OK***
4. Log in sequence diagram   ***OK***
5. Discout rule management sequence diagram  
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