Answer:
I have three heads. Cut off one I become stronger. Cut off two I become ten.
The eight of us go forth not back to protect our king from a foe's attack. What are we?
What is black when you buy it, red when you use it, and gray when you throw it away?
You can never eat me for breakfast or lunch. What am I?
I help engines spin and pants stay up.
I flow from the Homerβs mouth when he sees doughnuts.