This ring is made of tourmaline.

Tripoli is the capital of Libya.

My friend came from Tripura.

I was born and raised in Edmonton.

I went to see the beautiful scenery of the Han River.

He is working as a member of the International Criminal Police Organization.

He holds a very high position in that company.

What is the common difference of this arithmetic sequence?

He found a victim who had been strangled.

He was strangled by the criminal.