The ruling on one who leaves a prostration and does not remember from which unit it was

Question:
In his second question, he says: If a person leaves a prostration and does not know which unit it was in, knowing that I was in the final unit?

Answer:
If he leaves a prostration and does not know from which unit it was, he performs an extra unit before he concludes the prayer. He stands and performs a unit in place of the unit from which he left the prostration, then he prostrates for forgetfulness, and then he concludes the prayer. Yes.
That is: he prostrates for forgetfulness after the tashahhud, after he has performed the tashahhud, the greetings, and the prescribed supplication, he prostrates for forgetfulness and then concludes the prayer. Yes.