11.   But in the last quarter century, there has been a strong rebound, as Indians have defiantly rejected assimilation.

12.   But over the last quarter century the focus has shifted from these set time-frames to when a fetus can survive outside the womb.

13.   But such rationalizations get you only so far in an economy that has grown steadily less egalitarian over the last quarter century.

14.   During most of the last few centuries, the prevailing notion was that race was inborn.

15.   Economists have only just begun to grope towards a consensus about the hows and whys of the events of the last quarter century.

16.   Harold M. Ickes has survived some of the bitterest Democratic Party wars of the last quarter century, but he recently passed a new sort of milestone.

17.   His was the most successful and popular presidency of the last quarter century.

18.   However, in the last quarter century, the vice presidency has emerged as an important national office with increasing responsibilities.

19.   Indeed, during the last quarter century of PRI control, Mexico plunged into economic chaos after each president left his six-year term.

20.   Kavalovski says the orchestra, like any living organism, has changed over the last quarter century.