open class <lineMarker>A</lineMarker> {
  open fun <lineMarker>a</lineMarker>(){
  }
}

open class <lineMarker>B</lineMarker> : A(){
  override fun <lineMarker><lineMarker>a</lineMarker></lineMarker>(){
  }
}

class C : B(){
  override fun <lineMarker>a</lineMarker>(){
  }
}