anchor.diff:  
   create_entity(Behavior, Definition) ->
   	Entity = #entity {
  +		id = make_entity_id(),
   		behavior = Behavior
   	},
   
  
positive.code: 		}
  	end.
  
  
negative.code: 
  	% Set the entity's default behavior
  	Entity = InitialEntity#entity {
  		id = make_entity_id(),
  		behavior = Behavior,
  		client = ClientInfo
  	},
  