Puffer train This was created simply by perturbing the sides of a B-heptomino with two LWSS's. A B-heptomino is a naturally occurring object that lurches forward at the speed c/2 before its own debris usually destroys it. Not here! The LWSS keep it alive. See BHEPTO, RAKE, RAKE2. For a super dirty puffer, see LINEPUF.Xref: bhepto linepuf rake rake2