They had to experience for themselves the true price of existence.

Eyes developed quite a following during their first few years of existence.

They seem to have a lot of existence in one place.

A few minutes more of existence were worth the having.

And we were the only ones who knew of their existence!

During 71 years of its existence the university had about 4100 students.

He asked her how she knew of the girl's existence.

I had to start thinking, now, in terms of her private existence.

Until now, he had been the third to know of its existence.

I wanted to give you time to learn of your new existence.