11.   The strongest challenge of his uncompromising book is to those who would have it the other way around.

12.   Their strongest challenge is expected to come from UCLA and Maryland, two schools with several youth national team players on their rosters.

13.   Unz would likely present the strongest challenge to Campbell, according to John J. Pitney, a political scientist at Claremont McKenna College.

14.   Greece does not yet meet all the Maastricht Treaty criteria for EMU entry, with inflation posing the strongest challenge.

15.   He faced his strongest challenge from Alan Garcia, a discredited ex-president returned from exile, and Lourdes Flores, a conservative former congresswoman.

16.   He faced his strongest challenge from Garcia, a discredited ex-president returned from exile, and Lourdes Flores, a conservative former congresswoman.

17.   He faced his strongest challenge from Lourdes Flores, a conservative former congresswoman, and Alan Garcia, a discredited ex-president returned from exile.

18.   He faces his strongest challenge from Lourdes Flores, a conservative former congresswoman, and Alan Garcia, a discredited ex-president returned from exile.

19.   He picks Australia, Switzerland, South Africa and Denmark as their strongest challenges.

20.   His candidacy has given Democratic Revolution its strongest challenge yet in northern Mexico, where it is traditionally weak.