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class Person(val name: String) {
    private val friends = mutableListOf<Person>()

    fun getFriends() :  List<Person>{
        return friends;
    }

    infix fun befriend(person: Person) {
        friends.add(person)
        println("${this.name} is now friends with ${person.name}")
    }
}

fun main() {
    val alice = Person("Alice")
    val bob = Person("Bob")

    alice befriend bob
    println(alice.getFriends())
}