He is immersed in the study of panmagic squares.

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

Kamakura Udaijin is the courtesy name of Minamoto no Sanetomo.

He trains every day with a bokken.

Fir trees beautifully color the winter landscape.

Various colorful shrubs are planted in my garden.

Kimiko is my best friend.

He continues to hone his calligraphy skills.

Mr. Iriki is my best friend.

Understanding the algorithm of the regression tree is difficult.