Abstract: A dynamic sequencer (17) for sheets printed two-up and slalom on continuous forms comprising an input section (22) for two sheets (19-a and 19-b) in a plane flanking relationship with respect to a longitudinal axis (27) and a collecting station (24) for the superposed sheets. Overlapping device (23) moves the sheets from the input section (22) to the collecting station (24) along two respective trajectories (28, 29) maintaining a constant transversal trim. The trajectories (28, 29) include divergent portions (31, 32) divergent in height from the input section, approaching portions (33, 34) approaching the sheets toward the longitudinal axis (27) and concurrent portions (36, 37) concurrent in height toward the collecting station (24).