Facade.kt

class SubsystemA {
    fun operationA() {
        // implementation
    }
}

class SubsystemB {
    fun operationB() {
        // implementation
    }
}

class Facade {
    private val subsystemA = SubsystemA()
    private val subsystemB = SubsystemB()

    fun operation() {
        subsystemA.operationA()
        subsystemB.operationB()
    }
}