21.   The company said soon afterward that it had traced the problems to two bottling plants, one in Antwerp and the other in Dunkirk, France.

22.   The electric problems were traced to a faulty cable.

23.   The Innu trace their problems with poverty and substance abuse to government relocations that forced them to give up their nomadic way of life.

24.   The Indians trace their problems to the arrival of the Spaniards.

25.   The problem was traced to the use of a synthetic sponge.

26.   The problem can be traced to a combination of good fortune and faulty planning.

27.   The problem can be traced to both the White House, which has been slow to forward nominations to the Senate, and Senate delays in confirming them.

28.   These days, most American problems can be traced to too many people, not too few.

29.   They seem united by a sense that many world problems can be traced to a profit-hungry corporate elite.

30.   Tracing the problem to manure runoff at chicken farms, the major Eastern Shore industry, the governor proposed stricter environmental regulations costly to the poultry industry.