If you look at your original post, your colleagues were complaining of the incompleteness of information/take home message contained in your message. The current response to my post is informative! contrary to your earlier message. Nadhani umenielewa, sasa message yako umeeleweka. Mie siyo mwanafunzi, nimemaliza some 30 years back. Nakufundisha uweze kuandika kitu ambacho ni self explanatory for your lecturers to award you sufficient marks to pass your exams in your university education you are about to undertake!!!