21.   Several forces combined to produce the unexpected outcome, analysts said.

22.   Seldom in recent years has the aviation world been so thunderstruck by the chain of events combining to produce an air disaster.

23.   Smith said immigration, along with social and medical factors, have combined to produce high tuberculosis rates on the border.

24.   So that is how Saint-Saens, the Norman mantelpiece, and an Amish-trained cabinetmaker combined to produce a cabinet as sublime as the music it holds.

25.   Stock makes the best cooking liquid, but water works almost as well, because as it simmers with the chicken they combine to produce a flavorful broth.

26.   The factors combine to produce more goals and fewer whistles.

27.   The high filament temperature and the halogen gas combine to produce a brilliant white light.

28.   The team effort combines to produce a highly complex, deep gin with floral, spicy and even earthy undertones.

29.   The two combine to produce an abnormal warming of sea surface temperatures in the eastern Pacific known as El Nino.

30.   These doubts, plus the disciplined if deceptive salesmanship of Gov. George W. Bush, have combined to produce months of erosion for Gore.