The system is accessible function passing by a sort ordering that equates all sorts.

We start by computing the following initial DP problem:

  P1. (1) eval#(x, y, z) => eval#(x + 1, y + x, z) | x >= y
      (2) eval#(x, y, z) => eval#(x - z, y + z * z, z - 1) | x >= y

***** No progress could be made on DP problem P1.