He would not even want her existence known to the rest of us.

Soon it'll be time to make your existence known, and to sell our story.

The existence of magic is well known in this world.

The existence of petroleum has been known since the 8th century.

During Jefferson's life the book's existence was known only to his friends and family.

The existence of the diary was not known until last month.

The existence of the rope is not known at all.

The existence of this danger has been known since well before 9/11.

The existence of this group has been publicly known since the 1950s.

The existence of this cabinet soon became generally known to every one.