Tokens = N Types = |V | Shakespeare 884 thousand 31 thousand Brown corpus 1 million 38 thousand Switchboard telephone conversations 2.4 million 20 thousand COCA 440 million 2 million Google n-grams 1 trillion 13 million Figure 2 .11 Rough numbers of types and tokens for some English language corpora. The largest, the Google n-grams corpus, contains 13 million types, but this count only includes types appearing 40 or more times, so the true number would be much larger.