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## `๐”ฝยด ๐•ฉ`: Fold
Fold over `๐•ฉ` with `๐”ฝ` from right to left i.e. Insert `๐”ฝ` between the elements of `๐•ฉ`.
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+`๐•ฉ` must be a simple list (`1 = =๐•ฉ`).
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+ยด 1โ€ฟ2โ€ฟ3
1+2+3