Google Books Ngram Viewer

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

1900 - 1928 1929 - 1967 1968 - 1973 1974 - 1989 1990 - 2000 crux of the problem English
1900 - 1928 1929 - 1967 1968 - 1973 1974 - 1989 1990 - 2000 crux of the matter English

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