Create patterns for words rather than sentences

[zaidalyafeai]

When there is an error in extract_tf3eelav3 the pattern generation stops for the whole sentence. Maybe a better solution is to generate patterns for words and then merge them.

[MagedSaeed]

I really like this idea. Hope it will work fine with us. I even want to go further and decouple the tasks in that function into subfuctions.