chance occurrence

For most women it is a chance occurrence and eventually stops happening.

The performance differences are so large that they are unlikely to be a chance occurrence.

It can also be difficult to know if a cluster is anything more than a chance occurrence.

Or can it be more likely found in that vast appendix of chance occurrences called life?

You have great trust in the chance occurrences involved in such form.

Doctors and parents would have no reason to believe it was anything but a chance occurrence.

He did not realize that some chance occurrence might have changed the situation.

"Is this venture a chance occurrence, or has some change in Federation policy prompted it?"

With any luck this was just a chance occurrence and had nothing to do with her.

Her own life, after all, seems to have had more than its share of accidents and chance occurrences.