11.   But exactly how the timing codes work is a matter of vigorous debate.

12.   But it is also bound to spark a vigorous debate in the courts.

13.   But many uncertainties persist, and in Germany, as elsewhere in Europe, the appropriate standards for testing cattle remain under vigorous debate.

14.   But off-screen a vigorous debate was developing among economists and others over whether the system deserves saving.

15.   But the accusations and counter-accusations set off a vigorous debate about what has become fair game for public disclosure and discourse in Washington.

16.   But public recognition of the bubble might finally propel America into vigorous debate about ways to control the market fever.

17.   But there is still a vigorous debate over whether the trend is good for listeners.

18.   By my senior year, we had vigorous debates that spilled into evening arguments over the very existence of God.

19.   Certain groups that had been on a list of candidates for inclusion in a new asset-blocking order were knocked off after a vigorous debate.

20.   Educators predict a vigorous debate next year, when most of the money available faces reauthorization.