i’m sorry everybody, but i didn’t wanna google one, and i don’t have time for a normal one, so this is probably one everybody heard in 1st grade.$
l’illuy nishmas amichai’s bubby, yitta chaya bas chaskal noach. 9 shvat.
Everybody knows, that the Gematriah of Bo=3, the 3 Makkos listed in Bo, and Va’era=Vav=6, and Alef=7(the first Vav, and last Alef, which equals 10, the 10 Makos.$