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Checks if the character string may be used as an n-gram and its notation follows specific convention of biogram package.
biogram
is_ngram(x)
character string representing single n-gram.
character
TRUE if n-gram's notation is correct, FALSE if not.
TRUE
FALSE
# NOT RUN { print(is_ngram("1_1.1.1_0.0")) print(is_ngram("not_ngram")) # }
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