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

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