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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/range_windows.html).*
# Up Down Arrow (`↕`)
## `↕ 𝕩`: Range
Return all indices that would index into an array of shape `𝕩`.
When given a single number, range from `0` to `𝕩-1`.
↕ 4
↕ 4‿5
## `𝕨 ↕ 𝕩`: Windows
Overlapping slices from `𝕩` of shape `𝕨`.
5 ↕ "abcdefg"
a ← 3‿3⥊↕9
2‿2 ↕ a
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