We use the principle proposed in [9] to compute phrase translation probabilities, except that we generalize it to multilingual contexts: since there is no "source" and "target" languages in our multilingual alignments, each language becomes the "source" in turn, and all remaining languages together become a single "target" one.
assuming an input corpus in L languages, a score is computed for each language i (1 ≤ i ≤ L).