In view of the above discussion,we therefore hold that the respondent's failure to join his duties at Ukai resulted in unauthorised absence and his failure to join his duties in spite of the repeated reminders and letters issued to him constituted sufficient valid ground for taking action under Regulation No.113.We further hold that before issuing the order of discharge the respondent was not only warned but he was also afforded an opportunity to explain as to why disciplinary action should not be taken against him