The 600-cell is one of the regular polytopes in four dimensions.

I have been studying Japanese for six months.

He picked up a six-chambered revolver.

It's difficult to calculate the area of this hexagon.

We have a responsibility to protect this world.

I wake up at six o'clock every day.

Souroku is my best friend.

My birthday is on the sixteenth.

The six holes of the human body play a very important role.

My grandfather is already sixty years old.