A method of molding a hollow, reinforced molded plastic article. The sodium nonatitanate materials of the invention are highly selective at separating strontium from solutions derived from the dissolution of irradiated target materials, thus reducing target processing times. Each time a player presses an X button, a selection state of an enemy object as a target of the player object is switched by turns according to priorities of the enemy objects. A first absolute destination is determined based on the first action and the user identification information.