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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/groupindices_group.html).*
# Square Cup (`⊔`)
## `⊔ 𝕩`: Group Indices
Group the indices of the major cells of `𝕩` by their respective values.
## `𝕩` must consist of integers. Groups start from 0.
⊔ 4‿5‿6‿6‿4‿7‿5
(↕8) ≍ ⊔ 4‿5‿6‿6‿4‿7‿5
## `𝕨 ⊔ 𝕩`: Group
Group the major cells of `𝕩` by their respective indices in `𝕨`.
If an element corresponds to `¯1`, it is excluded from grouping.
An extra element can be added to the end of `𝕨` to specify length of the result.
1‿0‿1‿2‿2‿3‿3 ⊔ 4‿5‿6‿6‿4‿7‿5
1‿0‿1‿¯1‿¯1‿3‿3 ⊔ 4‿5‿6‿6‿4‿7‿5
1‿0‿1‿¯1‿¯1‿3‿3‿10 ⊔ 4‿5‿6‿6‿4‿7‿5
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