add h2s remove copied output, ascii filenames

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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/catch.html).*
+
+# Circled Triangle Down (`⎊`)
+    
+## `𝔽⎊𝔾 𝕩`, `𝕨 𝔽⎊𝔾 𝕩`: Catch
+    
+Apply `𝔽` to the arguments. 
+    
+If an error happens when `𝔽` is applied, cancel its execution, apply `𝔾` to the arguments and return the results. 
+    
+Otherwise, return the results of `𝔽`.
+    
+           ∾⎊{"error occurred with argument: "∾•Fmt 𝕩} 1
+
+           ∾⎊{"error occurred with argument: "∾•Fmt 𝕩} ⟨⟨1,2⟩, ⟨3,4⟩⟩
+
+