Chiming in from theoretical linguistics: it is impossible for natural languages to "count", i.e. make reference to numbers other than 0, 1 or infinity.
As an example, there are languages where prenominal genitives are impossible (0).
Then, there are languages, such as German, where only one prenominal genitive is possible (1):
> Annas Haus
> *Annas Hunds Haus
Finally, there are languages, such as English, where an infinite number of prenominal genitives are possible (infinity).
> Anna's house
> Anna's dog's house
> Anna's mother's dog's house
> Anna's mother's sister's ... dog's house
But there are no languages where only two or three prenominal genitives are possible.
This property is taken to be part of Universal Grammar, i.e. the genetic/biological/mental system that makes human language possible.
As an example, there are languages where prenominal genitives are impossible (0).
Then, there are languages, such as German, where only one prenominal genitive is possible (1):
> Annas Haus
> *Annas Hunds Haus
Finally, there are languages, such as English, where an infinite number of prenominal genitives are possible (infinity).
> Anna's house
> Anna's dog's house
> Anna's mother's dog's house
> Anna's mother's sister's ... dog's house
But there are no languages where only two or three prenominal genitives are possible.
This property is taken to be part of Universal Grammar, i.e. the genetic/biological/mental system that makes human language possible.