21.   Despite the billions of words that have been written about Bill and Hillary, the true nature of their relationship remains a jealously guarded secret.

22.   Exactly how Dif scores are calculated is a closely guarded IRS secret.

23.   Hershey says these details would enable others to figure out a closely guarded secret -- the total number of futures contracts it holds.

24.   Her name remained a closely guarded secret for decades.

25.   However, his identity as a New Yorker writer has never been a closely guarded secret.

26.   If anyone saw such an offensive giant in him, it was a quietly guarded secret.

27.   In fact, the place where Hussein sleeps each night, let alone the quality of the sleep he gets, is a tightly guarded secret.

28.   Just how deeply the budget could be cut is a closely guarded secret.

29.   Many Talk executives, both former and present, have said that the terms of the partnership have been a closely guarded secret.

30.   Most of the cases, he and other executives said, remain carefully guarded corporate secrets.