Finding appropriate tenses and moods of irregular verbs proved especially difficult, as in many places the present tense appears to be used for completed events to increase the sense of drama and action. A hard core of unmatchable words was still outstanding at the end of the project. From the triple dictionary, a postings dictionary was prepared. There is one pair for each old-form variant. In our experiments.
Digrams have a length of two, and trigrams have a length of three.
One padding space is added at each end of the word in the case of digrams, and three in the case of trigrams. The putative matching old-forms are then sorted in descending order according their Dice coefficient values. The effectiveness of retrieval was evaluated in a manner analogous to that used for the evaluation of experimental document retrieval systems. The recall of a search is defined to be the percentage of the appropriate variants that are retrieved. Overall, LCS performed better than n -gram matching, and digrams were nearly always better than trigrams.