Give Freebase Sets some sample topics and it will figure out what they have in common and try to find more topics that match that set.
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The Profane Game
flightwise (formerly fboweb.com)
Flex Hotel Search
Python Interface for Amazon Web Services
Credits API Documentation
Yahoo! Search API Tutorial
JGE Automatic Content Generator
Freebase-Python client library
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.