A community mining system analyzes objects of different types and relationships between the objects of different types to identify communities. The system and method may be used to assist a trader in selecting an item of interest, such as the inside market to be displayed relative to a user configured location on the trading screen, such as the center of the trading screen. The resolution conversion and compression processes may also be used in the coding of the moving-picture signal. The pipe handling apparatus is used for handling, storing and replacing pipe stands during the tripping out and tripping in processes. The system then determines an ordering of the e-mail threads based on the thread rank associated with each e-mail thread. The undercut is defined radially inwardly of the blade attachment slots provided at the periphery of the disk.