of each token of ¯ fi and ej , we calculate the translation probability

as t (ej | fi ) =

|ngram(ej ) ∩ ngram( ¯ fi )|

|ngram( ¯ fi )|

for forward

translation—similar for backward with ¯ej = D(ej ),

(IV) ELSE Give equal probabilities for the remaining words from

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