31.   But most cases involve previously unknown groups, and authorities usually cannot even confirm such groups exist.

32.   Gusayev said no such group formally existed.

33.   It is impossible to determine if such a group actually exists.

34.   It was impossible to determine if such a group actually exists.

35.   Officially, NATO denies that the groups even exist, and it has denied they will cause problems for the British-led mission dubbed Operation Essential Harvest.

36.   Several bomb threats against stores were made in December using that name, but police have not determined whether such a group actually exists.

37.   South Korea has denied that such a group exists.

38.   The government denies paramilitary groups even exist in Mexico.

39.   The Hezbollah group did not exist.

40.   The Punjab insurgency was crushed two years ago, but small Sikh rebel groups still exist and occasionally launch terrorist attacks.