2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/75632An infinite sequence of 0's and 1's evolves by flipping each~1 to a~0 exponentially at rate one. When a~1 flips, all bits to its right also flip. Starting from any configuration with finitely many 1's to the left of the origin, we show that the leftmost~1 moves right with linear speed. Upper and lower bounds are given on the speed.21ppProbabilityCombinatorics60J27, 60J75text