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Lazy S (`∾`)
`∾ 𝕩`: Join
Join all elements of `𝕩` together.
Element ranks must be compatible.
```
∾ ⟨1‿2, 3, 4‿5⟩
⟨ 1 2 3 4 5 ⟩
m ← (3‿1≍⌜4‿2‿5) ⥊¨ 2‿3⥊↕6
┌─
╵ ┌─ ┌─ ┌─
╵ 0 0 0 0 ╵ 1 1 ╵ 2 2 2 2 2
0 0 0 0 1 1 2 2 2 2 2
0 0 0 0 1 1 2 2 2 2 2
┘ ┘ ┘
┌─ ┌─ ┌─
╵ 3 3 3 3 ╵ 4 4 ╵ 5 5 5 5 5
┘ ┘ ┘
┘
∾ m
┌─
╵ 0 0 0 0 1 1 2 2 2 2 2
0 0 0 0 1 1 2 2 2 2 2
0 0 0 0 1 1 2 2 2 2 2
3 3 3 3 4 4 5 5 5 5 5
┘
```
`𝕨 ∾ 𝕩`: Join
Join `𝕨` to `𝕩` along the first axis.
```
"abcd" ∾ "EFG"
"abcdEFG"
a ← 3‿3 ⥊ ↕9
┌─
╵ 0 1 2
3 4 5
6 7 8
┘
c ← 4‿3 ⥊ ↕12
┌─
╵ 0 1 2
3 4 5
6 7 8
9 10 11
┘
a∾c
┌─
╵ 0 1 2
3 4 5
6 7 8
0 1 2
3 4 5
6 7 8
9 10 11
┘
```
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