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Topics will allow you to look for certain group of words and themes. For example, you can create a topic on Product Bugs and add words related to that topic.
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If you want to look for a group of words, you can add the signs && in the search. To look for company excellence, you need to type in company&&excellence. The search will be showing every comment that contains the word company AND excellence.
If you click to view a topic, you will only see the words of your topic appear in the text responses, summarization and ranking table.
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You can always go back to add or remove words from the topic.