1.   Firstly, you need to work out how much water you use - estimates vary from area to area.

2.   More recent estimates have varied wildly.

3.   Estimates vary widely because there are so many definitions of abuse.

4.   But there is no agreement on the way these costs should be calculated and estimates vary so widely as to make them practically meaningless.

5.   As to how many warheads each side has, in addition to conventional forces, estimates vary.

6.   But rumors of impending layoffs had swirled for weeks, though estimates varied widely.

7.   Certainly, estimates vary widely on when the market for voice and data-switching equipment and Internet routers will recover from the debilitating decline in sales this year.

8.   Cost estimates vary widely.

9.   Estimates vary greatly.

10.   Estimates vary on the duration of fatigue.