anchor.diff:  	case bc_entities:entity_config(EntityType) of
   		{ok, BcEntityConfig} ->
   			{ok, BaseNum, State1} = player_num(State),
  -			{ok, SpawnBcVertices, State2} = spawn_vertices(State1),
  +			{ok, SpawnBcVertices, State2} = spawn_matrix(State1),
   			spawn_entities(EntityType, State2),
   			{ok, State2};
   		error ->
  
positive.code: 			{ok, Num, State}
  	end.
  
  spawn_vertices(#state{base_num = BaseNum,
  					  spawn_vertices = SpawnBcVertices,
  					  map = BcMap} = State) ->
  	case SpawnBcVertices of
  		undefined ->
  			BcVertices = case BaseNum of
  							 1 -> bc_map:base1_spawn_vertices(BcMap);
  
negative.code: %%====================================================================
  %% Internal functions
  %%====================================================================
  
  base_num(BaseBcVertices, BcMap) ->
  	BaseBcVertex = lists:nth(1, BaseBcVertices),
  