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𝔽⎉𝕘 𝕩, 𝕨 𝔽⎉𝕘 𝕩: Rank

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Apply 𝔽 to cells at ranks given in 𝕘. Non-negative numbers indicate the rank of the cell and negative ones indicate the difference from full rank.

The ranks applied are given by the following:

• ⎉ c Rank-c cells of 𝕩 (monadic) or both arguments (dyadic)
• ⎉ b‿c Rank-b cells of 𝕨 and rank-c cells of 𝕩 (dyadic)
• ⎉ a‿b‿c Rank-a cells of 𝕩 (monadic), b-cells of 𝕨 and c-cells of 𝕩 (dyadic)

  a ← 3‿2‿4⥊"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  
  ⌽⎉2 a