In the second phase of this research data, a literature reviews important information important for researchers who have used the information from the literature review. This shows the details and information from others that are related to the topic of the previous several sources this information again to the next for the first preliminary data analysis of this research, important secondary data is extremely convenient for finding information. On the other hand, secondary data, this may not be good enough and relevant to the research question. In the end, researchers have evaluated this information based on information such as the purpose of the sources to date, trust the authority of academic content and the interpretation of the data.
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