In this paper, we propose an unsupervised method for discovering inference rules from text, such as "Xis author ofY ~.Xwrote ~", "'X solved Y ~](found a solution to Y", and "X caused Y ~ Y is triggered by X". Inference rules are extremely important in many fields such as natural language processing, information retrieval, and artificial intelligence in general. Our algorithm is based on an extended version of Harris ' Distributional Hypothesis, which states that words that occurred in the same contexts tend to be similar. Instead of using this hypothesis on words, we apply it to paths in the dependency trees of a parsed corpus. 1
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