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def isISBN(code):
"""
Returns True is the argument is a string that contains a valid ISBN-10 code,
False otherwise.
>>> isISBN('9971502100')
True
>>> isISBN('9971502108')
False
>>> isISBN('53WKEFF2C')
False
>>> isISBN(4378580136)
False
"""
if __name__ == '__main__':
import doctest
doctest.testmod()