Like that: ```interface Pet { fun makeVoice() ...
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Like that:
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interface Pet {
    fun makeVoice()
}

class Dog(val voice: String) : Pet {
    override fun makeVoice() { println("$voice $voice") }
}

class MyDog(val voice: String): Pet by Dog(voice) {

    override fun makeVoice() {
        makeVoice()
        makeVoice()
    }
}