31.   TERRORISTS in Northern Ireland yesterday breached tight security to set off a bomb which injured two policemen, one seriously.

32.   All this set off a firestorm in the press and with fans, and the series was canceled.

33.   Almost immediately, the popovers fell on their sides and made such a mess they would eventually have set off the smoke detector.

34.   Although no animals recovered voluntary movement, the researchers said they were able to set off leg muscle activity with electrical stimulation.

35.   Although the announcement was not a surprise, it still set off an exciting ripple that history was in the making.

36.   An anonymous love letter circulates among the residents of a small New England town setting off enough rendezvous, revelations and romantic misunderstandings to fill a Shakespeare comedy.

37.   An antigen is a molecule that will set off the forces of the immune system to get rid of things that may be bad for us.

38.   An abrupt withdrawal of the West Africans could set off renewed fighting.

39.   An airport spokeswoman said the request shortened the time people waited in line, because metal plates in shoes could set off the detectors.

40.   And a small motor sets off vibrations within the unit during some game actions.