/)/ 𝕩: IndicesRepeat the index of each element in 𝕩 by the element's value. 𝕩 must be rank 1.
/ 1‿2‿3 ⟨ 0 1 1 2 2 2 ⟩ / 1‿0‿1 ⟨ 0 2 ⟩
𝕨 / 𝕩: ReplicateRepeat each major cell in 𝕩 by the corresponding element in 𝕨.
Unit 𝕨 applies to all elements.
3 / "copy" "cccooopppyyy" 1‿0‿1 / 1‿2‿3 ⟨ 1 3 ⟩