Select a group, for example, in a study using the method of selection of bulk (Cluster Sampling) that are divided into 3 groups of 12 system based on the relationship of each group and select the work-system 3 the system has taken place, education is a System Security Module Card system link Module and System Manager Module Interchange Dispute after making the choice was made to collect classified data from the fault testing system backwards 3 system by performing this procedure starting from considering all the defects that occur in reverse. The system
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