In which country do people greet each other by locking thumbs?

People greet each other by locking thumbs in the country of Zambia.

Explanation:

There are different ways of greeting people followed around the world. Shaking of hands is the most common way of greeting practised. But on the other hand, there are also a few ways of greeting which may look unfamiliar and bizarre. One such way is the locking of thumbs. This way of greeting is practised in the East African country of Zambia.

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