anchor.diff:  %% Function: dump() -> {gb_tree:gb_trees(), {Date, Time}}
   %% Description: gets the logging state
   %%--------------------------------------------------------------------
  +-spec dump() -> {gb_tree(), {integer(), integer(), integer()}}.
   dump() ->
       gen_server:call(?MODULE, {dump}).
   
  
positive.code: %% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
  %% Description: Convert process state when code is changed
  %%--------------------------------------------------------------------
  code_change(_OldVsn, State, _Extra) ->
      {ok, State}.
  
  
negative.code: %%                                      {stop, Reason, State}
  %% Description: Handling call messages
  %%--------------------------------------------------------------------
  -spec handle_call({dump}, any(), #state{}) -> {reply, any(), #state{}}.
  handle_call({dump}, _From, State) ->
      Reply = {State#state.map, State#state.start},
      {reply, Reply, State};
  