1. Create an instance category named Initialization for FrogMuppet.
2. Create an instance method named initialize for FrogMuppet.
3. Set the instance variable greeting to 'Hi Ho' in the initialize method.
4. Create an instance category named Initialization for GrouchMuppet.
5. Create an instance method named initialize for GrouchMuppet.
6. Set the instance variable greeting to 'Go Away' in the initialize method.