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Let me guess, radix-tree variant with common prefixes of keys at the branches of the tree and counters at the leaves.

Nope, totally off. It's closer to probabilistic hashing where the probabilities of picking successive buckets are exponentially decreasing.

That's not counting. That's estimating. I based my guess from the title of the post.

Which is why you should &A^*($@# read before commenting.

Do you need to draw attention to your lack of a specific swear by creating a visually-distinct meta-swear?