What data structure am I going to write about next?

After a break, I’m back to writing more Data Structures / Algorithms content that you all have been asking me about. Based on the below image, can anybody guess what data structure I am about to write about next? :nerd_face: :palm_tree:

Merkle trees.

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You win! :partying_face:

And, the article is now live :slight_smile: