We used an English-French phrase table from the Portage Machine Translation Toolkit (Larkin et al., 2010) to determine additional pairs AB-X.
8 for each AB-F entry in the phrase table (where F is a French term) we keep the five most frequent English unigrams and the five most frequent English bigrams (other than AB) that are also aligned to F. Among the 4,095 ABs, 454 occurred in the phrase table.