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For any input noun- "scientists", "guitarists", "gardeners" or "actors", say- KnowItAll tries to find sentences on websites that contain that noun and looks for words that often appear after it. In this way it might find the phrases "scientists such as" and "scientists including". It then feeds these to 12 search engines and extracts the words that tend to follow, which are often scientists' names. But certain phrases like "scientists such as botanists" also fulfill the search criteria. The software can work out that "botanists" is not a name, and it can use this to inject "botanists such as" into the engines to obtain an even fuller list of scientists' names.
Based on the frequency of occurrences of a word and its context to the search term, KnowItAll assigns a probability that word is a correct match. All of these hits are then returned in a list of decreasing probability. It will also allow the user to find words that are close to the input item to further pare down the list.
Further information about KnowItAll, including research papers and a database for use in sample searches, can be found here.
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