code: func (s *Simulation) AddNodesAndConnectFull(count int, opts ...AddNodeOption) (ids []enode.ID, err error) {
  	if count < 2 {
  		return nil, errors.New("count of nodes must be at least 2")
  	}
  	ids, err = s.AddNodes(count, opts...)
  	if err != nil {
  		return nil, err
  	}
  	err = s.Net.ConnectNodesFull(ids)
  	if err != nil {
  		return nil, err
  	}
  	return ids, nil
  }
docs: // AddNodesAndConnectFull is a helpper method that combines
  // AddNodes and ConnectNodesFull. Only new nodes will be connected.