Up Down Arrow (`↕`)

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`↕ 𝕩`: Range

Return all indices that would index into an array of shape 𝕩.

When given a single number, range from 0 to 𝕩-1.

    ↕ 4

    ↕ 4‿5

Overlapping slices from 𝕩 of shape 𝕨.

    5 ↕ "abcdefg"

    a ← 3‿3⥊↕9

    2‿2 ↕ a