Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  

No valid ngrams to plot!
Ngrams not found: door_NOUN=>open, [door_NOUN=>open], space_NOUN=>open, [space_NOUN=>open], window_NOUN=>open, [window_NOUN=>open], air_NOUN=>open, [air_NOUN=>open], mouth_NOUN=>open, [mouth_NOUN=>open], spaces_NOUN=>open, [spaces_NOUN=>open], eyes_NOUN=>open, [eyes_NOUN=>open], market_NOUN=>open, [market_NOUN=>open], question_NOUN=>open, [question_NOUN=>open], doors_NOUN=>open, [doors_NOUN=>open], access=>open, [access=>open], data=>open, [data=>open], source=>open, [source=>open]
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