Circle With Two Dots (⚇)

𝔽⚇𝕘 𝕩, 𝕨 𝔽⚇𝕘 𝕩: Depth

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Apply 𝔽 to the cells of the arguments at depth given in 𝕘. Negative numbers count down from the top level and non-negative ones from the bottom up.

    1⊸↓⚇1 ⟨⟨1,2,3⟩, ⟨4,5,6⟩⟩
⟨ ⟨ 2 3 ⟩ ⟨ 5 6 ⟩ ⟩

    1 ↓⚇1 ⟨⟨1,2,3⟩, ⟨4,5,6⟩⟩
⟨ ⟨ 2 3 ⟩ ⟨ 5 6 ⟩ ⟩

    (+´↕)⚇0 ⟨2,4‿7,3⟩  # Implements pervasion
⟨ 1 ⟨ 6 21 ⟩ 3 ⟩