He gripped the control stick and piloted the plane.

The thirteenth day of the month is my birthday.

The 24-cell is one of the convex regular polytopes in four dimensions.

He found a regular dodecahedron-shaped spicy cod roe.

He made a model of a regular icosahedron.

Before starting a new business, he said, 'Nothing ventured, nothing gained.'

He read ten books.

I went to the market accompanied by my mother.

My son participates in judo practice every day.

This is an important problem.