He had only a handful of scholars and, in the virtual absence of written sources for his research, he began a programme of recording oral recollections.

The virtual absence of tsetse flies in the region has led, moreover, to increased livestock raising as a major occupation in the north.

Its curved lines, inclined arches and virtual absence of right angles make the geometric shape of the bridge very sophisticated.

These are usually very small flies, yellow or black and appearing shiny due to the virtual absence of any hairs.