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Table 2 

Number of n-grams with explicit conditional probability estimates assigned by the 4-gram language models after entropy pruning of M1 at threshold values θ. Perplexities over the (concatenated) tune-nw reference translations are also reported. The Kneser-Ney and Katz 4-gram LM have 416,190 unigrams, which are not removed by pruning.

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