1.   All moral rules it seems, derive their strength from the original incest taboo and lose their reliability if this taboo is weakened.

2.   The policy inefficacy proposition derives its strength from the potent combination of the rational expectations hypothesis with the new classical macroeconomics.

3.   They derive their strength from the realization that not to abide by them would make for an unworkable constitution.

4.   We can derive a strength from being a family company that other businesses cannot.

5.   Early in the day, the bond market rose along with the dollar, which derived strength from signs of economic weakness in Germany.

6.   Every great religion derives its strength from fundamentals, and in that sense every believer is a fundamentalist.

7.   Samper will no doubt derive more strength from an absolution in Congress, the only body able to judge the president.

8.   The Great Basin high derived its strength from weighty cold air at low levels in addition to the weighty convergence of air at high altitudes.

9.   Tornadoes are caused by strong thunderstorms which derive their strength from humid air and energetic jet stream disturbances.

10.   Unlike Western dance, it was rooted in the earth, from which it also derived its strength, and was an inescapable part of aboriginal dance.