No one knew who had built the shortcuts, or what their exact purpose was.

Not any single official document has been found so far allowing us to understand the exact purpose of these numbers.

The exact purpose to which these private funds were to be put was unambiguous.

The exact purpose of the call is not known, but research suggests that fish react to it.

However, historians are not agreed as to the exact purpose of the book.

We can't tell its exact purpose, but it seems to be going up quickly.

The exact purpose and meaning of the stone is unclear.

Like I'd transported her across the state line for that exact purpose.

The exact purpose of the call is not known, but research suggests that fish know what it means.

He had often wondered at the exact purpose of the lamps.