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Mark the first occurrence of each major cell in 𝕩 with a 1, and all other occurrences with a 0.
∊ 4‿5‿6‿6‿4‿7‿5
a ← 3‿3 ⥊ ↕9
∊ a
Is each cell in 𝕨 a major cell of 𝕩?
⟨1⟩ ∊ ↕9
b ← 3‿3 ⥊ ↕9
⟨0‿1‿2⟩ ∊ b
⟨1‿3 ⥊ 0‿1‿2⟩ ∊ b