Complex multisite with multiple languages

I must make a network that has one domain and three sites with the same theme but different content. Each site will have three languages.

Here is an example of what I have to do:

example.com (here the user selects the country)

And here are the other nine websites:

• austria.example.com/en
• austria.example.com/de
• austria.example.com/fr

• england.example.com/en
• england.example.com/de
• england.example.com/fr

• germany.example.com/en
• germany.example.com/de
• germany.example.com/fr

At this moment I have a WordPress multisite installation with SUBDOMAIN_INSTALL = true.

How can I do this kind of setup with only one installation of WordPress?

Thank you in advance!