Fixed-point computations

Define the necessary data structures to represent set expressions, equations, and systems of equations;

Define a function or method that performs a single iteration of the fixed point computation. That is, given an assignment from set variables to actual sets, it returns another assignment with the set variables updated;

Define a function or method that computes the solution of a given system of equations from an initial assignment to the set variables in the system;

Define a function or method that solves each of the systems of equations shown at the beginning of this assignment and outputs the corresponding solutions.

Please find attached the detailed instruction.