use the following clues to answer the questions below:

• 92 students have a dog, a cat, or an "other" pet.
• 66 students have a dog.
• 57 students have a cat.
• 39 students have an "other" pet .
• 15 students have only a dog and a cat.
• 12 children have only a dog and an "other" pet.
• 5 children have only a cat and an "other" pet.
• No child has two of each type of pet.

How many students have all 3 types of pets?