Wordn-grams for cluster keyboards
Nils Klarlund, Michael Riley · 2003
A cluster keyboard partitions the letters of the alphabet onto subset keys. On such keyboards most words are typed with no more key presses than on the standard keyboard, but a key sequence may stand for two or more words. In current practice, this ambiguity problem is addressed by hypothesizing words according to their unigram (occurrence) frequency. When the hypothesized word is not the intended one, an error arises.