Google Books Ngram Viewer

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

1920 - 1947 1948 - 1964 1965 - 1968 1969 - 1994 1995 - 2000 leftwing English
1920 - 1957 1958 - 1988 1989 - 1992 1993 - 1996 1997 - 2000 rightwing English

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