The Chaotic Return

Corrected QL SuperBASIC chaos program responding to the challenge posed in issue 4. Replaces POINT with BLOCK for the physical coordinate system, and randomizes the value of r (r = 5 + 512*(r-3)) rather than sweeping sequentially, causing the full bifurcation diagram structure to become visible progressively rather than rendered one line at a time. Full SuperBASIC listing provided (Chaos4_bas).