*3.3. Topic Extraction*

The topic extraction is the final step of understanding and understanding the topics found. The meaning of the topic is determined by analyzing the most likely terms along with the most likely related documents. First, a thorough investigation was performed on the relevant documents to verify that the initial interpretation based on word probability was meaningful. Second, the two researchers independently interpret and label 21 topics, and each topic is classified into one of five theme categories, except for minor word differences.
