code: def actions_for_category(category):
      
      actions = set()
      for action, action_category in _action_categories.items():
          if action_category == category:
             actions.add(action)
      return actions
docs: Returns set of actions containing each group passed in.
      
      Param:
          category must be in {'Permissions', 'List', 'Read', 'Write'}
      
      Returns:
          set of matching actions