Shots were fired in my Discrete Math textbook

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N N ES cE E N Ka,b,c a,b a,c a b,c) 6 c) FIGURE 1.2. A decision tree for selecting a subset of a, b, c). Remark. A picture like this is called a tree. (This is not a formal definition: that will follow later.) If you want to know why the tree is growing upside down, ask the computer scientists who introduced this convention. (The conventional wisdom is that they never went out of the room, and so they never saw a real tree.)