code: def create_tree(endpoints):
      
      tree = {}
  
      for method, url, doc in endpoints:
          path = [p for p in url.strip('/').split('/')]
          here = tree
  
          # First element (API Version).
          version = path[0]
          here.setdefault(version, {})
          here = here[version]
  
          # The rest of elements of the URL.
          for p in path[1:]:
              part = _camelcase_to_underscore(p)
              here.setdefault(part, {})
              here = here[part]
  
          # Allowed HTTP methods.
          if not 'METHODS' in here:
              here['METHODS'] = [[method, doc]]
          else:
              if not method in here['METHODS']:
                  here['METHODS'].append([method, doc])
  
      return tree
docs: Creates the Trello endpoint tree.
  
      >>> r = {'1': { \
                   'actions': {'METHODS': {'GET'}}, \
                   'boards': { \
                       'members': {'METHODS': {'DELETE'}}}} \
              }
      >>> r == create_tree([ \
                   'GET /1/actions/[idAction]', \
                   'DELETE /1/boards/[board_id]/members/[idMember]'])
      True