In an OFDM-based receiver, a time synchronization unit comprising: A. The computer system includes a switch, a system power supply unit and an operation control unit. The list of recognized symbol strings may include a first similarity score associated with each recognized entry. A first timing chain connects a drive sprocket of the crankshaft with the input sprocket of the cam phaser and a second timing chain connects the output sprocket of the cam phaser with the driven sprockets of the camshafts. Each of the groups of users uses the first copy of the common control file to customize the tool for the group of users.