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How many private instance variables are there? Refer to the following UML Class Diagram when answering this question. Pet - name : int - age

How many private instance variables are there?
Refer to the following UML Class Diagram when answering this question.
Pet
- name : int
- age : String
- hasFleas : Boolean
+ licenseNumber : String
+ weight : float
+ Pet()
+ Pet(name : String, age : int)
+ getName() : String
- setName(name : String) : void
+ getAge() : int
+ setAge(age : int) : void
+ speak() : void
- scratch(itches : int) : void
+ toString() : String

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