Version 2.2
The ngram search engine has been provided by Professor Satoshi Sekine of New York University. For an explanation of the Ngram search mechanism see his COLING08 paper or its long version.
For search contexts use * as wild card and *POS* to search for a part-of-speech. The main search term of the pattern has to be a regular word. Examples searches are * door and a *JJ* house *.