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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/insert.html).*
# Double Acute Accent (`˝`)
## `𝔽˝ 𝕩`: Insert
[→full documentation](../doc/fold.md)
Fold over cells of `𝕩` with `𝔽` from end to start, that is, insert `𝔽` between the major cells of `𝕩`.
a ← 3‿3 ⥊ ↕9
+˝ a
0‿1‿2 + 3‿4‿5 + 6‿7‿8
## `𝕨 𝔽˝ 𝕩`: Insert With Initial
[→full documentation](../doc/fold.md#initial-element)
Monadic insert, but use `𝕨` as initial right argument.
If
b ← 3‿3 ⥊ ↕9
1‿1‿1 +˝ b
1 +˝ b
0‿1‿2 + 3‿4‿5 + 6‿7‿8 + 1‿1‿1
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