11.   But the most embarrassing mistake occurred when two technicians in the city Health Department laboratory moved to test this letter.

12.   But then a seemingly tiny mistake occurred while Gianni was recuperating in the neonatal intensive care unit of Stony Brook University Hospital in Stony Brook, N.Y.

13.   But the trial is unlikely to pinpoint where such a mistake may have occurred, attorneys said.

14.   But when you have covered some things and those mistakes occur, those are not acceptable.

15.   Deadly mistakes like these occur in every war.

16.   Eight years later, doctors are trying to understand how a terrible mistake occurred.

17.   Even some NATO and American officials acknowledge that they cannot explain how or why so many mistakes occurred.

18.   Hull and other specialists said similar mistakes have occurred before, but are rare.

19.   However, mistakes do occur.

20.   If an adult takes over when a mistake occurs or when a child forgets to do the task, the child is stripped of powerful lessons of responsibility.