A method and system are described for a two step precharging of bitlines in a memory array. The porous ceramic layers can be filled with hydrophobizing, hydrophilizing, dirt-repellent and corrosion-inhibiting substances which remain in the substrate or are supplied later on demand, or with bactericidal substances, aromatics, perfumes or inhalation substances which are delivered to the room air in precise doses. Additional information regarding jump points is recorded on a space of the information storage medium other than where the clips are recorded. A pair of tear lines is formed in the front panel with each extending from the waist opening to one of the respective leg openings. The present invention improves the uniformity of the light emission and improves the module maintenance convenience.