A referral management system can provide functionality of tracking referrals for professionals. The support and the drive are set in a workspace which is arranged in an upper portion of the module, and the lower portion of the module has a free space which is laterally accessible from the outside and which communicates upwardly with the workspace at a top of the free space. At least a portion of the hidden data is exposed according to inputs from the player for determining a guessed combination. The subject methods and systems do not employ or involve the application of an electrical signal from an external source to the electrochemical cell for purposes of performing the sample detection phase and are, thus, less complicated and involve fewer steps and components. A structure produced by this process is also disclosed. The active matrix substrate fabricates a first group of pixel electrodes that are aligned and supplied with picture signals of a first polarity, and a second group of pixel electrodes that are aligned to adjoin with the first group of pixel electrodes respectively and are supplied with picture signals of a second polarity.