fun test1(a: Any, x: Collection<Any>): Boolean {
  return x.contains(element = a)
}

fun test2(a: Any, x: Collection<Any>): Boolean {
  return x.contains(element = a).not()
}

fun <T : Any?> test3(a: T, x: Collection<T>): Boolean {
  return x.contains(element = a)
}

fun <T : Any?> test4(a: T, x: Collection<T>): Boolean {
  return x.contains(element = a).not()
}
