Yet there is even the occasional exception to this rule.

He'd made occasional exceptions to that rule, of course, and this time was a very important exception.

With occasional exceptions, these key characters appear in every episode.

There have been occasional exceptions to this rule during special events.

Nobody seems to make much of a fuss over them, with an occasional exception.

However, this does not mean that we shouldn't consider an occasional, temporary exception.

Despite occasional welcome exceptions, this seems to me to characterize a great deal of modern human bureaucratic and political behavior.

From that point He 111 losses were light, with occasional exceptions.

Of course, there are occasional exceptions which only go to prove the rule.

It emerged from being more than an occasional exception during the late 1970s.