21.   Worse tragedies have happened, as Shakespeare, Tolstoy and Dickens have attested.

22.   Yet at times a tragedy like this happens anyway.

23.   But tragedies already are happening.

24.   But you should know, a tragedy happened to us too.

25.   The killings Tuesday of the children hiking with their classmates shocked the nation and forced the military to explain how such a tragedy could have happened.

26.   The Melinda Lee was sailing from the Tonga islands to New Zealand when the tragedy happened.

27.   The tragedy happened following months of running battles between Cheung, a scavenger, and her neighbours who occupied tiny cubicles in the Shau Kei Wan flat.

28.   The tragedy happened when hundreds of Liverpool fans arriving late for the F.A. Cup semifinal against Nottingham Forest were directed into an already full section of the Hillsborough stadium.

29.   The tragedy happened when tons of earth, loosened by heavy rains, slid down a hillside and buried workers at an irrigation canal.

30.   Building engineer Selemani Ntayira said such a tragedy could happen again.