Given a text, write a compressed version of it in a single sentence.

This assessment is based on an extensive review of FBI files and interviews with agents and supervisors at FBI Headquarters and various field offices.
This assessment is based on an extensive review of FBI files and interviews.

Account Online View your statement, see unbilled activity or pay your bill on the Internet.
Account Online let's you view and manage bills and statements online

What is missing, for example, at square the circle, is the information that because the area of a circle is mathematically calculated using pi, which is irrational, there is no mathematical way of calculating the dimensions of a square with the same area as that of a given circle. But that does not mean that such a square cannot exist.
For example, at square the circle, the information is that because the area of a circle is mathematically calculated with pi, there is no way to calculate the dimensions of a square with same area as the given circle.