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def is_palindrome(s):

if s == '':

return True

else:

if (ord(s[0]) - ord(s[len(s)-1])) == 0:

is_palindrome(s[1:len(s)-1])

else:

return False

print (is_palindrome(''))

#>>> True (expected = True)

print(is_palindrome('abab'))

#>>> False (expected = False)

print(is_palindrome('abba'))

#>>> None (expected = True)

print (is_palindrome('andrea'))

#>>> None (expected = False)

print(is_palindrome('abaaba'))

#>>> None (expected = True)