1.   Surrounded by swarms of their own kind, those quarks and gluons will not, in effect, realize that they are free.

2.   Inside the former army school building, swarms of flies surrounded a man sleeping on a patch of straw that barely covered the concrete floor.

3.   Inside the former army school building, swarms of flies surrounded a man sleeping on straw which barely covered the concrete floor.

4.   Inside the former army school building, swarms of flies surrounded a man sleeping on the straw, which barely covered the concrete floor.

5.   Once she got to the front, a swarm of fans surrounded her asking for autographs and posing for pictures.