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A tree diagram is not the type of thing epidemiologists would usually draw, because it seems obvious.

AlphaGo is powered by two deep neural networks that guide its machine learning and search techniques, arriving at the best move by narrowing and shortening the tree diagram of possibilities.

But Carroll, a mathematician by trade, wrote to a friend, in a letter included in the exhibition, asking for advice, and provided him helpfully with a tree diagram of name possibilities.

The reason is evident from the tree diagram: there is only one path from one number to the other two numbers, hence at most two common ancestors, hence at most two different lengths.

After scanning your computer for space-hogging programs, it displays them according to size in a handy tree diagram.