11.   Reports to the FDA are made voluntarily and thus could underestimate the number of women experiencing arrhythmia after taking erythromycin, the study said.

12.   Some critics of the Bosnian operation accused the Pentagon and administration of underestimating the number of U.S. military forces likely to be involved.

13.   The exercise, spokesmen for the groups said, was intended to diminish the influence of Muslims in America by underestimating their numbers.

14.   Union leaders also appear to have underestimated the number of workers who would cross the picket line.

15.   Yet Brodie said many people vastly underestimate the number of Americans who have died from AIDS.

16.   A rebel group has accused the Mexican army of committing abuses in the southern state of Guerrero and underestimating the number of soldiers killed in a recent confrontation.

17.   Afghan fighters say the Americans underestimated the number of al-Qaida and Taliban forces in the area.

18.   But some say the government merely underestimated the number of AIDS patients.

19.   Diplomats and other observers believe Phnom Penh underestimates the number of men the Khmer Rouge still commands in its jungle strongholds.

20.   Even assuming the government has underestimated the number of rebel fighters, the defections would seem to come close to crippling the guerrillas as a serious political force.