How does the X11 algorithm work?

Question

Cryptography

Dear experts on cryptographic algorithms, please explain how the X11 cryptographic algorithm works.
Question:
If this is a chain of 11 different crypto algorithms, do they have an established rule for working in turn: A; B; C; and so on...or do they work randomly?
Question two:
In any of the options, is it possible to specify work forcibly with only one algorithm?
Thank you!