case 15: comm = new NebulaGas();break;
case 16: comm = new ChemicalSupplies();break;
case 17: comm = new GemStones();break;
case 18: comm = new OpticalComponents();break;
case 19: comm = new Liquor();break;
case 20: comm = new HydrogenFuel();break;
case 21: comm = new ExoticMatter();break;
case 22: comm = new BioWaste();break;
case 23: comm = new Slaves();break;
case 24: comm = new Drugs();break;
case 25: comm = new NutrientClods();break;