1. How many ways are there to give four snacks to six puppies, with no more than one snack going to each puppy?
2. How many ways are there to give four snacks to six puppies, with gluttony and cruelty allowed?
3. How many ways are there to deal five ace cards and four queen cards to nine card players?
4. How many ways are there to feed 12 spinach stems (of different lengths) to four ducks such that the grey duck gets five spinach stems, the white duck gets five spinach stems, and the pale-grey and black ducks get one spinach stem each?