Triggers the realization of (1) the establishment of triggers c_general, if C_1 operating table have the following functions: C_1 occur when the table changes to show the records before and after modifications to the table when C_1 insert a record, the record shows that when the table insert C_1 some courses to delete records, delete, and these form SC_1 elective courses in the corresponding record, please fill out the statement in part to help complete the flip-flop c_general

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