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Software system's clones are usually two aspects influence on software maintenance and management. One is some clones are effective and can reuse. The other is some clones are unsafe and need revise or reconfiguration. The reason is that the changes of code clones are different. How to determine the clones' attribute of effective or unsafe, it need to track clone changes in the evolution versions of a software system. We firstly find the clones and clone groups in multiple versions of adoi:10.14257/ijsia.2016.10.3.03 fatcat:c6hgby3kyney7jvua7ledtk5si