1.   But clustering of the orbits of comets and asteroids is a demonstrated fact.

2.   Clustering of high fertility families, and geographical and social isolation of some estates, May be important too.

3.   As Infinity grew, it cobbled together powerful clusters of stations in markets such as New York, Los Angeles and Philadelphia.

4.   But rarely in Southern California is there any cluster of buildings so serenely civilized.

5.   Clusters of spruce and pillowy, orange quaking aspens carpet the middle ground.

6.   Look along the ground for a creeping plant with rose-hued stems and clusters of very small, soft, oval leaves.

7.   Pink clusters of sticky geraniums.

8.   The round clusters of tiny lavender flowers deliver a splendid performance along roadsides and even play beautifully in home landscapes.

9.   Nine months later the trees produce clusters of nuts the size of small grapefruits that fall to the ground when ripe.

10.   The Nigerian Alpha jets circled overhead for about an hour, searching for clusters of rebel fighters.