Bigram

A bigram or digram is a sequence of two adjacent elements from a string of tokens, which are typically letters, syllables, or words. A bigram is an n-gram for n=2. The frequency distribution of every bigram in a string is commonly used for simple statistical analysis of text in many applications, including in computational linguistics, cryptography, speech recognition, and so on.Bigrams are used in most successful language models for speech recognition. They are a special case of N-gram.The frequency of the most common letter bigrams in a small English corpus is: