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.

He is immersed in the study of panmagic squares.

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

She won the beauty contest last year.

He finished the exam without any mistakes.

He completed the piano performance without making any mistakes.

He finished the exam without mistakes.

He made a careless mistake in the test.

He likes to take a walk in the park at dusk.