21.   It was not the first such tragedy to occur at a Bonnke rally.

22.   It was the second time in recent months that the city has faced such a tragedy.

23.   It was the second such tragedy to hit the state in five months.

24.   On the eve of a new semester another MIT student has died from substance abuse, despite efforts by the school to prevent such a tragedy.

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

27.   Thirty-five pilgrims died last year in a stampede during that ritual, the third such tragedy in less than a decade.

28.   It was the third such tragedy in less than a decade.

29.   Several relatives and residents, however, could not help asking how such a tragedy could occur.

30.   Such a tragedy must not happen again, they said.