<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def run_notebook_hook(notebook_type, action, *args, **kw):
    ''' Run an installed notebook hook with supplied arguments.

    Args:
        noteboook_type (str) :
            Name of an existing installed notebook hook

        actions (str) :
            Name of the hook action to execute, ``'doc'`` or ``'app'``

    All other arguments and keyword arguments are passed to the hook action
    exactly as supplied.

    Returns:
        Result of the hook action, as-is

    Raises:
        RuntimeError
            If the hook or specific action is not installed

    '''
    if notebook_type not in _HOOKS:
        raise RuntimeError("no display hook installed for notebook type %r" % notebook_type)
    if _HOOKS[notebook_type][action] is None:
        raise RuntimeError("notebook hook for %r did not install %r action" % notebook_type, action)
    return _HOOKS[notebook_type][action](*args, **kw)