[Kotlin] Private question.

private class PP {
     private var i = 1
     private fun privateF() {
          i += 1
     }
     fun access() {
          privateF()
     }
}
class OC {
     fun test() {
          val pc = PP()    
     }
}

Here, why is it possible to create an object without private in the test() in the class OC?

There's no explanation for this, so I was looking for it. One person said the function is accessible because it's higher than the class. Another person said it's a function in the class, so it's basically public, but it's hidden, so it's possible because it's the same as private.

Please explain why it is possible.

I'm very curious because I have to understand how it works!!!