My four treasures of the study are a fountain pen, a pencil, an eraser, and a ruler.

He is doing squats to train his quadriceps femoris muscle.

I saw a cackling goose in the park.

Please calculate the quartiles of this data set.

We have our wedding on the twenty-fourth.

This regular tetrahedron is composed of equilateral triangles on all sides.

This is a model of a muoctahedron.

This is a 六角四片四角孔ねじれ正多面體, in other words, a muoctahedron.

He warned the young people, saying 'At thirty, one should not be careless, at forty, one should not be indecisive.'

The 24-cell is one of the geometric shapes in four dimensions.