11.   They said they had underestimated the problems of registering and accrediting so many delegates.

12.   I think we have underestimated the problem.

13.   Chirac conceded in general that he had perhaps underestimated the problems facing him when he was elected in May presidential polls.

14.   Chirac conceded Thursday he had perhaps underestimated the problems facing him when he was elected in May presidential polls.