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Table A.2

Features used in the preposition error correction system trained discriminatively. wB and wA denote the word immediately before and after the target, respectively; the other features are defined similarly. compHead denotes the head of the preposition complement. wB&compHead, w2BwB&compHead are feature conjunctions of compHead with wB and w2BwB, respectively. Adapted models also use the author's preposition as a feature.

Feature TypeFeature list
Word n-gram wB, w2B, w3B, wA, w2A, w3A, wBwA, w2BwB, wAw2A, w3Bw2BwB, w2BwBwA, wBwAw2A, wAw2Aw3A, w4Bw3Bw2BwB, w3w2BwBwA, w2BwBwAw2A, wBwAw2Aw3A, wAw2Aw3w4A 
 
Preposition complement compHead, wB&compHead, w2BwB&compHead 
Feature TypeFeature list
Word n-gram wB, w2B, w3B, wA, w2A, w3A, wBwA, w2BwB, wAw2A, w3Bw2BwB, w2BwBwA, wBwAw2A, wAw2Aw3A, w4Bw3Bw2BwB, w3w2BwBwA, w2BwBwAw2A, wBwAw2Aw3A, wAw2Aw3w4A 
 
Preposition complement compHead, wB&compHead, w2BwB&compHead 
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