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) => eval#(x - 1, x) | x > 0 /\ y > 0
      (2) eval#(x, y) => eval#(y - 2, x + 1) | x > 0 /\ y > 0

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