˘
𝔽˘ 𝕩
𝕨 𝔽˘ 𝕩
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Apply 𝔽 to/between the major cells of the arguments. (𝔽⎉¯1)
𝔽
𝔽⎉¯1
a ← 3‿3 ⥊ ↕9 <˘ a ⟨ ⟨ 0 1 2 ⟩ ⟨ 3 4 5 ⟩ ⟨ 6 7 8 ⟩ ⟩ a ≍˘ a ┌─ ╎ 0 1 2 0 1 2 3 4 5 3 4 5 6 7 8 6 7 8 ┘