He is immersed in the study of panmagic squares.

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.

This fish is completely farmed, and no capture is done in the natural environment.

This programming language is said to be Turing complete.

My personal thought is that everyone should be treated equally.

He values his private life.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

He was born as an illegitimate child and experienced many difficulties.