class MyMap<K : Any, V : Any> : AbstractMutableMap<K, V> {
  constructor() /* primary */ {
    super/*AbstractMutableMap*/<K, V>()
    /* <init>() */

  }

  override fun put(key: K, value: V): V? {
    return null
  }

  override val entries: MutableSet<MutableEntry<K, V>>
    override get(): MutableSet<MutableEntry<K, V>> {
      return mutableSetOf<MutableEntry<K, V>>()
    }

}