31.  This was the fourth such attack in three days.

32.  This is the fourth attack on the secretariat in the past two years.

33.  This was the fourth attack against a tourist train this month.

34.  It was the fourth attack on the secretariat in the past two years.

35.  It was the fourth attack within eight days.

36.  It was the fourth bomb attack in Bahrain since mid-January.

37.  It was the fourth attack on Jewish properties in the same area following similar attacks in October and November.

38.  It was the fourth fatal attack attributed to the ETA in the past week.

39.  Perry made the remark at a news conference after a suicide bomb exploded in Tel Aviv, the fourth attack on civilians in Israel in eight days.

40.  The blast was the fourth such attack in Ethiopia in two weeks.