@@ -0,0 +1,228 @@
+package planstack;%0A%0Apublic interface UniquelyIdentified %7B%0A%0A    /**%0A     * An integer that gies a unique identifier to this object.%0A     * This id will then be used for primitive int to X hash maps%0A     */%0A    public int id();%0A%7D%0A

Create a new interface "UniquelyIdentified"