skill trees
My computer gaming experience mostly peaks around the era of Sid Meier's Alpha Centauri and Ultima, so I'm only vaguely familiar with skill trees. Could you describe how they might apply here in a bit more detail?
Think of a research tree, then. Or more formally, a simple directed graph. Nodes can be "on" or "off", meaning you (claim to) have or not have the skill that node describes. A nodes can be a prerequisite for other.
This can be taken many ways, but one obvious example would be a "sequences comprehension tree". One node per part of the sequences, with the parts that part is based on as prerequisites. You could claim a node to express confidence you've understood (or even agreed with?) that particular part, track your progress, an...
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