def precook(s, n=4, out=False):
"""
Takes a string as input and returns an object that can be given to
either cook_refs or cook_test. This is optional: cook_refs and cook_test
can take string arguments as well.
:param s:
:param n:
:param out:
:return:
"""
words = s.split()
counts = defaultdict(int)
for k in xrange(1,n+1):
for i in xrange(len(words)-k+1):
ngram = tuple(words[i:i+k])
counts[ngram] += 1
return (len(words), counts)
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