Please calculate the quartiles of this data set.

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

This shape is a parallelogram.

The twenty-four divisions of the solar year, or 'Nijyushi Sekki', is a system that divides the year into 24 parts according to the changes in nature.

He is working round the clock.

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

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He said, 'Misery of life starts at literacy,' and spoke about the hardships of learning.

I am learning Simplified Chinese.

I have started learning Traditional Chinese.