A method can comprise parsing a PDF file to collect a plurality of primitive objects. Viewing history information of digital programs received on a plurality of broadcast channels and output to a user is generated and stored. The groups of transistors can have different physical parameters such as the width to length ratio of gates in field effect transistors and threshold voltages for the transistors. The thin crystal film is formed out of a material, which contains aromatic rings and has Bragg peak at 3.