It is randomized and invisible and done by only math. Turbo mode for instant figure or normal mode for satisfactory. Exactly 32,400,000,000 different possible outcomes.
All by me Double joint always has at least 2 lines of symmetry but triple joint can have 1 Interesting combinations I found: 53-46-25-7-162 61-19-49-135-55 58-39-8-63-143 64-23-32-145-169 12-61-30-2-148