saving millions
Dictionary is a book or electronic resource that lists the words of a language (typically in alphabetical order) and gives their meaning, or gives the equivalent words in a different language, often also providing information about pronunciation, origin, and usage.
Training your date on dictionary you get a ready-made index, plus you get a huge number of patterns that explain the meaning of the used by you words. Instead of many gigabytes of texts you can use only 20-26 megabytes, saving millions.