You and your dad are stranded on an island. You two are alone. A venomous snake bites your dad's balls. The only way to save him is to suck out the venom, from his balls.
e&m is so harsh gawd it would be better if my teacher did examples :( but she doesnt, she just walks through the general case argh it makes solving them hard all i have to use are the examples in the book ><