1.   A prime source of violence resides in the elitist educational strategies that are firmly rooted in the school ethos.

2.   At the receiving end of refugees from the Middle Volga, Rostov-on-Don was the prime source of cholera outbreaks.

3.   Efficiency in competition is thus a prime source of selection and occurs in many aspects of social life.

4.   For others, the arts and beauty are their prime source of pleasure and happiness.

5.   Noble landownership, the prime source of peasant resentment, was far from fading peacefully away.

6.   The Web is a prime source of insignificant factoids.

7.   Thus Blacks became a prime source of hostility for white unionists who set about erecting discriminatory barriers.

8.   Interfering in-laws are the prime sources of the blues.

9.   Emissions from the prime source of air pollution in the Arctic, industrial plants in the northern Soviet Union, have not been reduced.

10.   Also holding up the project is its prime source of data.