The conversation between human and AI assistant.
[|Human|] Find the number of 2-letter words in the English language.
[|AI|] There are approximately 101 two-letter words in the English language. These words are mainly used as abbreviations, expressions, or as particles in phrasal verbs. Some examples include "of," "to," "in," and "at."
[|Human|] 
Find the number of 2-letter words in the English language.