Ryosuke is my best friend.

He is undergoing electrotherapy for his back pain.

I am majoring in econometrics at university.

He goes fishing in the sea every day.

As it became autumn, the air became cool.

He is a salary thief, contributing nothing to the company.

He likes the character named Liang.

I think his soul is still lingering in this house.

We are planning to visit the mausoleum in the Meiji Shrine Outer Garden, east of the Imperial Palace, tomorrow.

The space complexity of this algorithm is O(n).