• the chaotic intervals merge together until iterates cover all of 0 ≤ x ≤ 1 at a=4 (sometimes, but inaccurately, called "inverse bifurcations");
• there exist many windows of periodic behaviour characterised by stable p-cycles with associated period-doubling cascade (p, 2p, 4p, 8p, ... -cycles).
e.g. a period 3 window is 3.8285 < a < 3.8494 (3.857)