1.   And since we built the park, the pitching ranks have thinned even more.

2.   But even those ranks soon will thin as the pipeline of female tech majors dries up.

3.   Now those ranks are thinning.

4.   The Memorial Day parade ranks have thinned in recent years.

5.   The ranks are thinning.

6.   The ranks are thinning fast.

7.   The ranks have thinned recently.

8.   But their ranks have thinned as they have divided into at least three factions.

9.   But their ranks have thinned due to battle casualties, surrenders and factionalism.

10.   But their ranks have thinned, due to battle casualties, surrenders and factionalism.