human
Solve the following python programming problem given the following code:
def base_n_decoder(alphabet = ALPHABET) : 
    'Decode a Base X encoded string into the number

    Arguments:
    - `string`: The encoded string
    - `alphabet`: The alphabet to use for encoding
    ' 
    base = len (alphabet) 
    char_value = dict (((c, v) for (v, c) in enumerate (c))) 
    def f(string) : 
        num = 0 
        try : 
            for char in string : 
                num = ((num * base) + char_value [char]) 
except KeyError : 
            raise ValueError (('Unexpected character %r' % char)) 
return num 
return f 

    
    

    Fix the buggy line: char_value = dict (((c, v) for (v, c) in enumerate (c)))
assistant
#Here is Python program to fix the buggy line: char_value = dict (((c, v) for (v, c) in enumerate (c)))
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char_value = dict (((c, v) for (v, c) in enumerate (alphabet)))