diff --git a/seed/challenges/03-back-end-development-certification/advanced-bonfires.json b/seed/challenges/03-back-end-development-certification/advanced-bonfires.json
index cbe3a8a3b9..31c04890a2 100644
--- a/seed/challenges/03-back-end-development-certification/advanced-bonfires.json
+++ b/seed/challenges/03-back-end-development-certification/advanced-bonfires.json
@@ -103,7 +103,8 @@
         "assert.deepEqual(sym([1, 2, 3], [5, 2, 1, 4]).sort(), [3, 4, 5], 'message: <code>sym([1, 2, 3], [5, 2, 1, 4])</code> should return <code>[3, 5, 4]</code>.');",
         "assert.deepEqual(sym([1, 2, 5], [2, 3, 5], [3, 4, 5]).sort(), [1, 4, 5], 'message: <code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should return <code>[1, 4, 5]</code>');",
         "assert.deepEqual(sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]).sort(), [1, 4, 5], 'message: <code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should return <code>[1, 4, 5]</code>.');",
-        "assert.deepEqual(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3]).sort(), [2, 3, 4, 6, 7], 'message: <code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should return <code>[7, 4, 6, 2, 3]</code>.');"
+        "assert.deepEqual(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3]).sort(), [2, 3, 4, 6, 7], 'message: <code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should return <code>[7, 4, 6, 2, 3]</code>.');",
+        "assert.deepEqual(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1]).sort(), [1, 2, 4, 5, 6, 7, 8, 9], 'message: <code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should return <code>[1, 2, 5, 6, 7, 8, 9]</code>')"
        ],
       "MDNlinks": [
         "Array.reduce()",