This is not a perfect world, and undoubtedly occasional instances of needless cruelty do occur.

In addition to the score, there were occasional instances where popular music was featured.

There have been occasional instances of violent crime against foreigners.

I am not talking of an occasional instance.

Despite these precautions, there have been rare but occasional instances of crime.

Historically the band has had one drum major (with an occasional instance of two).

"They worked more often at odds with one another with occasional instances of cooperation."

Despite "occasional instances of slow response time," he continued, "over all, the system is working very well."

There have been occasional instances of lawyers' demonstrating incompetence at trial, or even dozing off.

This breed is white with occasional instances of light brown to dark black spots on the feet and belly.