11.   A little misfortune, a little luck and a lot of determination combined to make Chilean soprano Veronica Villarroel an internationally renowned opera star.

12.   A warm day in Tokyo and a full building combined to make it an exhausting afternoon for the players.

13.   All of these have combined to make foreigners less willing to invest there.

14.   All of these factors combine to make an uncertain field where everything seems possible but nothing is easy.

15.   All of it combines to make an experience that is more frustrating than fun.

16.   All of these combine to make the operating system a good choice for firewalls and the paranoid.

17.   But none of this diminishes the obvious and aforementioned facts, all of which combine to make him the most dominant San Francisco figure since Joe DiMaggio.

18.   But somehow the barbecue and the beat-up cafe combine to make a celestial meal.

19.   But two factors are combining to make it bigger than ever these days.

20.   But, Dow argued, Ms. Tucker had five characteristics that combined to make her a media sensation.