log_file log_date log_time ocn year
            ocn.log.1        1        0        0
            ocn.log.1        1        0        0
            ocn.log.1        1        0        0
            ocn.log.1        1        0        1
            ocn.log.1        1        0        1
            ocn.log.1        1        0        1
            ocn.log.1        1        0        1
            ocn.log.1        1        0        2
            ocn.log.1        1        0        2
            ocn.log.1        1        0        2