anchor.diff:                  send(Target, Message, MoveFullId),
                   dht_node_state:set_slide(State, PredOrSucc, NewSlideOp)
           end,
  -    safe_operation(WorkerFun, MyState, MoveFullId, all, both, send_error_retry);
  +    safe_operation(WorkerFun, MyState, MoveFullId, all, send_error_retry);
   
   % no reply from the target node within get_wait_for_reply_timeout() ms
   process_move_msg({move, timeout, MoveFullId} = _Msg, MyState) ->
  
positive.code:                                 finish_delta_ack2(State, SlideOp, EmbeddedMsg)
                          end
                  end,
      safe_operation(WorkerFun, MyState, MoveFullId, [wait_for_continue], both, continue).
  
  % misc.
  
  
negative.code:                 SlideOp1 = slide_op:cancel_timer(SlideOp), % cancel previous timer
                  prepare_send_delta1(State, SlideOp1)
          end,
      safe_operation(WorkerFun, MyState, MoveFullId, [wait_for_data_ack], data_ack);
  
  % delta from neighbor
  process_move_msg({move, delta, ChangedData, MoveFullId} = _Msg, MyState) ->
  