Mental retardation is the understanding that the actual name of the PLA/body that resembles the three marks of existence until it is in the middle of the image and leave the place and seemed to reach Nirvana in the most.
It is wise to understand the mind into the truth of a sign / body that looks into the Trinity. It's the mental neutral And let's behalf, and seemed to attain in the end.
It is wise to understand the mind of noun / body that resembles a existence until a central to the noun. And abandon noun and seemed to Nirvana at the end.