A multilevel correlated magnetic system and method for using the same are described herein. The system also allows a user to vary the concentration and time for releasing the growth inhibitor chemical. The inner portion of the vertical pillar has a lattice constant smaller than that of the outer portion of the vertical pillar. Finally, the system compresses the inverted index based on a jump value associated with record identifiers in the column. The light reaching the sensor panel is detected by photoelectric converters. Additionally or optionally, when proceeding with this authentication procedure, the systems and methods further may include: displaying a second image on the screen; receiving new user input indicating a portion of the second image; and determining if this new input corresponds to a second acceptable user input for user authentication.