This box is perfectly square in shape.

This square box is very simple and beautiful.

What is in this box?

This plan was perfectly successful.

This project has been completed in its entirety.

What is this box used for?

He is a perfectionist, and his approach to work is very strict.

This programming language is said to be Turing complete.

His performance was perfect and without blemish.

In mathematics, a perfect number refers to a number where the sum of its divisors, excluding the number itself, equals the number.