This old house is the one where my grandparents lived.

Where is the entrance to this place?

You can see the true strength of the sumo wrestler in the official sumo tournament.

He is the custodian of this museum.

He is storing old documents in the archive.

This algorithm was developed for optimization.

We need to optimize this process.

It is difficult to find the optimal solution to this problem.

Bokuzo is my best friend.

Kuraji-san is my best friend.