A method of substantially simultaneously forming at least two fluid supply slots through a thickness of semiconductor substrate from a first surface to a second surface thereof. Transitions may include animation, such as to smoothly enter a view into or exit a view out of a scene over a number of rendering frames. The cutting ring forms a ventilating concavity which cooperates with the driving cam. Other viewing options and collection interactions are provided. The implant can be strengthened by reinforcement elements. As soon as the first group of sheets has been formed, it is moved from the first position to a second position in the collecting station, and then a predetermined number of sheets is moved to the first position in the collecting station so as to form a second group of sheets.