|I am very much grateful to my family :
Robel Arega, Jospeh Arega and Arega Nigusie,
my brothers and sisters: Dereje, Etalem, Tsegawit, Daniel, Dilnesaw and Aklilu Asrat for assisting
me in finalizing the write-up of NIBUT.
I also appreciate the contribution made by Mahelet Abay, Addis Mestesalem and the staff of SOFTNET Computer Engineering, p.l.c. in Ethiopia