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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
⟨ ⟨⟩ ⟨⟩ ⟨⟩ ⟨⟩ ⟨ 0 4 ⟩ ⟨ 1 6 ⟩ ⟨ 2 3 ⟩ ⟨ 5 ⟩ ⟩
(↕8) ≍ ⊔ 4‿5‿6‿6‿4‿7‿5
┌─
╵ 0 1 2 3 4 5 6 7
⟨⟩ ⟨⟩ ⟨⟩ ⟨⟩ ⟨ 0 4 ⟩ ⟨ 1 6 ⟩ ⟨ 2 3 ⟩ ⟨ 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
⟨ ⟨ 5 ⟩ ⟨ 4 6 ⟩ ⟨ 6 4 ⟩ ⟨ 7 5 ⟩ ⟩
1‿0‿1‿¯1‿¯1‿3‿3 ⊔ 4‿5‿6‿6‿4‿7‿5
⟨ ⟨ 5 ⟩ ⟨ 4 6 ⟩ ⟨⟩ ⟨ 7 5 ⟩ ⟩
1‿0‿1‿¯1‿¯1‿3‿3‿10 ⊔ 4‿5‿6‿6‿4‿7‿5
⟨ ⟨ 5 ⟩ ⟨ 4 6 ⟩ ⟨⟩ ⟨ 7 5 ⟩ ⟨⟩ ⟨⟩ ⟨⟩ ⟨⟩ ⟨⟩ ⟨⟩ ⟩
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