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Acute Accent (`´`)
`𝔽´ 𝕩`: Fold
Fold over `𝕩` with `𝔽` from right to left i.e. Insert `𝔽` between the elements of `𝕩`.
```
+´ 1‿2‿3
6
1+2+3
6
-´ 1‿2‿3
2
1-2-3
2
```
`𝕨 𝔽´ 𝕩`: Fold With initial
Monadic fold, but use `𝕨` as initial right argument.
```
5 +´ 1‿2‿3
11
1+2+3+5
11
5 -´ 1‿2‿3
¯3
1-2-3-5
¯3
```
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