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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/under.html).*
# Circle Jot (`⌾`)
## `𝔽⌾𝔾 𝕩`, `𝕨 𝔽⌾𝔾 𝕩`: Under
- Apply transformation `𝔾` to all arguments
- Apply `𝔽` to the transformed arguments
- Undo transformation `𝔾`
Where `𝔾` must be
1. A function invertible by `⁼` (Undo)
2. A structural modification
9⌾(1⊸⊑) 1‿2‿3
√⁼ (√1) + (√9)
1 +⌾√ 9
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