Find the missing permutation: Difference between revisions

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@@ Line 1,690: / Line 1,690: @@
         ];
-        return xs.slice(1).reduce(
+        return xs.reduce(
             (a, x) => zipWith(xor)(a)(codes(x)),
-            codes(xs[0])
+            [0, 0, 0, 0]
         ).map(x => String.fromCodePoint(x)).join('')
     };