Importance of 3-/4-grams

[grayswandyr]

Hi, I'm not specialist of keyboard layouts but was wondering why 3- and 4-grams aren't taken into account in the Engram model (IIUC), since e.g. 4 same-hand fingers could issue a 4-letter in-roll (?). Also, some 4-grams are particularly frequent (e.g. "tion" in French). Thanks for the good work.

[binarybottle]

Two simple reasons:

1. trigrams, 4-grams, and so on are composed of bigrams.
2. Even if certain trigrams and 4-grams are common, they are less common than most bigrams.