Next we investigated various ngram models, given the likelihood of all
sequences of break and non-break up to length N. The following table
shows the effect on performance of varying *N*.

It appears that from these experiments, the value of *N* is
not critical so long as it is above 2, i.e. so long a some context
is used. We used a variety of standard ngram smoothing techniques but
none had any significant effect on performance.

Tue Jul 1 17:09:00 BST 1997