The non-trivial part here is actually the source data (the dict file.) It is also its pitfall - after adding 5 for S you should see a lithany of plurals. Most d

The non-trivial part here is actually the source data (the dict file.) It is also its pitfall - after adding 5 for S you should see a lithany of plurals. Most dict files (for English anyway) however seem to omit plural nouns. I guess the logic is that in English most plurals are regular, and the naive algorithm for deriving them from the singular forms (correctly most of the time) is quite trivial.