





def   a_    ( lowerCAmelCase_      :			str	):
   __lowerCAmelCase								=	0
   for ch in input_str:
      __lowerCAmelCase								=	ord(lowerCAmelCase_	)
      __lowerCAmelCase								=	pow(2,	lowerCAmelCase_	)

      # If we already turned on bit for current character's unicode
      if bitmap >> ch_unicode & 1 == 1:
         return False
      bitmap |= ch_bit_index_on
   return True


if __name__ == "__main__":
     import doctest

     doctest.testmod()








def   a_    ( lowerCAmelCase_      :			str,	lowerCAmelCase_      :			int	):
   return [sentence[i : i + ngram_size] for i in range(len(lowerCAmelCase_	) - ngram_size + 1	)]


if __name__ == "__main__":
     from doctest import testmod

     testmod()

