human
Solve the following python programming problem given the following code:
def durationMethod(k) : 
    def m(cls, val) : 
        return ('%s %s' % (val, k)) 
return classmethod (k) 

    
    

    Fix the buggy line: return classmethod (k)
assistant
#Here is Python code to fix the buggy line: return classmethod (k)
.

return classmethod (def m()