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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
+    
+Fold over `𝕩` with `𝔽` from right to left i.e. 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
+    
+Monadic insert, but use `𝕨` as initial right argument.
+
+If 
+    
+           a ← 3‿3 ⥊ ↕9
+
+           1‿1‿1 +˝ a
+
+           1 +˝ a
+
+           0‿1‿2 + 3‿4‿5 + 6‿7‿8 + 1‿1‿1
+
+           
+
+