21.   Every periodic wave is equivalent to some unique harmonic spectrum and it is suggested that the reader should draw the spectrum corresponding to a square wave as an exercise.

22.   Although talented workers are in heavy demand, there has been wave after wave of layoffs, leading to wave after wave of goodbyes.

23.   AM waves are too big.

24.   And it is possible that he is wrong, and that gravity waves will be powerful enough for LIGO to detect after all.

25.   And now another wave of innovation is generating turn-of-the-century optimism.

26.   And the perfect wave is only a phone call away.

27.   And there has already been a wave of mergers in radio.

28.   And, the really big waves are nowhere near the Los Angeles area, but rather hundreds, even thousands of miles away.

29.   Ashurst said there had not been a wave of cancellations because of higher ticket prices.

30.   At least for now, the downsizing wave is swimmable.