The sudden occurance of rain surprised the picnic organizers.

We documented several occurances of unexpected latency during the experiment.

Although rare, an occurable complication must be considered before surgery.

The two outbreaks are co-occurring, complicating the public health response.

After the non-occurring of the annual meeting, many questions remained unanswered.

The team documented several potential risks, but most were classified as non-occurring under current conditions.

The glitch kept re-occurring despite our attempts to fix it.

It is common for thunderstorms and sudden temperature drops to co-occur in this region.

When fever co-occurs with severe headaches, doctors often order additional tests.

Several unexpected side effects co-occurred during the vaccine trial.