However, a major deficiency of this algorithm is that it does not make full use of the source side syntax, since it retains only the most frequent SAMT-style syntactic category to describe the rule's source syntax.
this algorithm penalizes all the other categories equally, although some may be more frequent than others, as in the case of DEG and DEV in the rule To some extent, the likelihood matching algorithm solves the main problem of 0-1 matching.