21.   Insider selling, indecipherable accounting practices and a stream of executive departures have combined to create a growing credibility gap between the company and Wall Street.

22.   Layers of humming guitar drones and feedback combine to create a slowly rising and falling wave of hypnotic sound.

23.   Moscow, for instance, has previously insisted that it never produced binary munitions, in which two different types of chemicals are combined to create a deadly poison.

24.   Now, new disclosure regulations and a rapidly deteriorating business climate have combined to create a nonstop cycle of bad news.

25.   Over time, several elements have combined to create a backlash against the EPA.

26.   Several cultural and political factors have combined to create a uniquely difficult environment for women here.

27.   Slowing sales and rock-bottom interest rates have combined to create the best buying opportunity in nearly four years.

28.   Technology and money have combined to create opportunities for political consultants that never existed before.

29.   The hydrogen and oxygen could then be combined to create energy.

30.   The problem for scientists is that these tiny eddies can combine to create important, sometimes unpredictable, effects at larger scales.