A light guide includes: an incident surface, an exit surface and two reflective surfaces. The system includes a source computing device configured to execute a synchronization engine configured to synchronize media files on the source computing device with copies of the media files on a target computing device. After printing, a collation is inserted into the envelope. The test access ports on an integrated circuit can be arranged in a hierarchy with one test linking module controlling access to plural secondary test linking modules and test access ports. Multiple misses occur before the prediction output is changed.