1. Keywords: Type in the keyword(s) which you are interested in.
2. Search type: There are two types of search available; one is ranked, which use some heuristics to measure the relevance of each document to user's query, and the most relevant document will be shown first. Another one is boolean, users can use boolean operator AND, OR, and NOT to form queries.
3. Clear: Clear the words you have typed in.

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