(prefix, v)
Adds the given prefix (the result of a call to common()) to the
        given value.
Adds the given prefix (the result of a call to common()) to the
        given value.
Adds the given prefix ( the result of a call to common () ) to the given value .
def add(prefix, v):
        """Adds the given prefix (the result of a call to common()) to the
        given value.
        """

        raise NotImplementedError
def add ( prefix , v ) : raise NotImplementedError