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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 to index into an array of shape `𝕩`, in the shape described by `𝕩`.
When given a single number, range from 0 to `𝕩-1`.
↕ 4
↕ 4‿5
## `𝕨 ↕ 𝕩`: Windows
Overlapping slices of `𝕩` which are of shape `𝕨`.
5 ↕ "abcdefg"
a ← 3‿3⥊↕9
2‿2 ↕ a
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