import java.util.*;

interface Part {}

interface Assembly {
    Collection getParts(); // Returns a collection of Parts
}

class Inventory {
    public static void addAssembly(String name, Collection parts) {} // Adds an assembly into the DB
    public static Assembly getAssembly(String name) { return null; } // Looks up an assembly in the DB
}

class Blade implements Part {}

class Guillotine implements Part {}

class G25 {
    public static void main(String[] args) {
        Collection<Part> c = new ArrayList<Part>();
        c.add(new Guillotine()) ;
        c.add(new Blade());
	Inventory.addAssembly("thingee", c);     // pass to "raw type"
	Collection<Part> k = Inventory.getAssembly("thingee").getParts();    // return from "raw type"
    }
}