class Test : IA by A(), IB by B()
interface IA {
    var a1: String?
    var a2: String?
    var a3: String?
    var a4: String?
    var a5: String?
}
interface IB {
    var b1: String?
    var b2: String?
    var b3: String?
    var b4: String?
    var b5: String?
}
class A : IA {
    override var a1: String? = null
    override var a2: String? = null
    override var a3: String? = null
    override var a4: String? = null
    override var a5: String? = null
}
class B : IB {
    override var b1: String? = null
    override var b2: String? = null
    override var b3: String? = null
    override var b4: String? = null
    override var b5: String? = null
}