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There are relatively few entailment heuristics that exploit the directional nature of the entailment relation. Our system uses directional methods based on the Corley and Mihalcea formula [3] for expressing the directional relatedness of texts which is then combined with conditions that must hold for the entailment to be true. The condition used as a starting point is that of Tatar et al [10]. Several other conditions have been gen- erated automatically based on the RTE-2009 development dataset using a variant of Genetic Programming. The word relatedness score required by the formula uses not only identity and synonymy, but almost all the Word- Net relations. We show the results that we have obtained by participating at the 2009 and 2010 editions of the RTE challenge.

Key words and phrases. textual entailment, directional relation, text relatedness, RTE, WordNet.