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In support to blog post
class Person {
class Apartment {
weak var person: Person?
var person: Person? = Person(name: "John Doe")
var apartment: Apartment? = Apartment(number: 123)
person?.apartment = apartment
apartment?.person = person
person = nil
apartment = nil
// output:
// John Doe is being deinitialized
// Apartment 123 is being deinitialized
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