2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143368We propose a new ternary infinite (even full-infinite) square-free sequence. The sequence is defined both by an iterative method and by a direct definition. Both definitions are analogous to those of the Thue-Morse sequence. The direct definition is given by a deterministic finite automaton with output. In short, the sequence is automatic.9 pages, 1 figures, to appear in Information Processing LettersDiscrete Mathematicstext