1.   As with other areas, global comparisons between black and white populations hide differences within the black population.

2.   By contrast, we have very powerful approaches to understanding individual differences within groups.

3.   Radical differences within the group began to appear.

4.   There are also clear differences within the black population.

5.   ...sectoral differences within social classes.

6.   In addition, there were differences within the circle of senior clerics.

7.   Gradually too they can be made aware of differences within a particular society in the past.

8.   There are many reasons why such spatial differences within nations emerge and are maintained.

9.   There are differences within.