Pattern or strategy for showing hierarchical response content?

I'm expanding my app's capabilities from this:

Current design for simple numeric result

...to displaying all the rules that were applied, results for each rule, rule description, and link to more info.

I'd really appreciate pointers to apps which solve this kind of detail/detail display well. Here is how a couple of other apps solve this problem. I feel like there can be better ways to do it:

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Edit: here's an interesting solution on duolingo.com:

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