1.   Critics have, however, found serious flaws in the whole approach.

2.   Even a superficial inspection revealed serious flaws.

3.   However, this analogy possesses two serious flaws.

4.   In general, any new cryptosystem could harbor serious flaws that are discovered only after years of scrutiny by cryptographers.

5.   The Maastricht process contains a serious logical flaw.

6.   This account contains a serious flaw.

7.   Almost all of these studies have serious flaws.

8.   Expert reveals serious flaws in museum and gallery security.

9.   And international observers cited few serious flaws in the counting process.