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Watts.
Because they can't find three wise men and a virgin.
Three. One to administer the anaesthetic one to extract the light bulb and one to offer the socket some vile pink mouthwash.
3, a person, a ladder, and another lightbulb
Just one, but the light bulb is going to need to change itself.
It's this really obscure number. You've probably never even heard of it. No big deal.
Ka-Mayomayo
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Find out in the next episode of Dragon! Ball! Z!