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Combine an array of arrays into one array. All elements of 𝕩 must have the same rank, and the result rank is that plus the rank of 𝕩.
Returns and boxed atoms unchanged.
a ← ⟨⟨1, 2⟩, ⟨3, 4⟩⟩
>a
≢a
≢>a
𝕨 and 𝕩 can both be either numbers or characters.
1 > 3
2‿3‿0 > 3‿1‿0
'a' > 'b'