But Mann had no idea that such a case existed.

We can't trace the calls, and the case doesn't exist anymore.

The instance is without a precedent; the case never existed before; and who can tell what may be the event?

But that does not mean that no other cases exist.

A special case exists, if there is enough energy to power the system directly.

However, cases still exist where people have not been able or willing to register as citizens.

It is not known how many more such cases might exist nationwide.

Only a few cases exist of an entire soundtrack being written specifically for a book.

Departing, he had made no effort to learn which case existed.

Taken one at a time, a good case exists for banning any number of products and services.