In this notation the above equation takes the following form: Because this is a point of contrast with the parsers described in the previous section, note that all of the conditional distributions are conditioned on one lexical item (either i or h).
only p(h t, l, m, u, i), the distribution for the head of c, looks at two lexical items (i and h itself), and none of the distributions look at three lexical items as do the trigram distribution of Equation 4 and the previously discussed parsing language models [4,15].