21.   Having a national police force gives South Africa an advantage in coordinating law-enforcement agencies, a big headache in Atlanta, he said.

22.   If we talk now about unification, they will only have a big headache.

23.   In all, it could become one big headache for Dole.

24.   In Boston, we have the Big Dig, which causes big headaches but promises to be a big success.

25.   Just as a ramshackle house stains a whole neighborhood, a tattered Mexico would be a big headache for its mighty cousin to the north.

26.   John Cummings, a graduate student at the University of California at Berkeley, has conquered friction, a big headache in tiny microelectro mechanical devices.

27.   Massey thinks Congress will fix this problem, which could cause big headaches for people forced to figure their AMT to claim certain credits.

28.   One big headache has been the body shop, where metal-stamping dies for body parts were sized incorrectly, Phillippi said.

29.   One big headache is keeping track of your cost basis, or the amount you paid for your shares.

30.   Parking is an increasingly big headache, he said.