📝 **Task:** Rewrite this safely: \`def add(x, lst=None):\` — if lst is None, start fresh list; append x; return list. Print \`add(1)\` and \`add(2)\` on two lines. Expected:\n[1]\n[2] 📋 Edit the starter code below. Tests run automatically. 💡 **Hint:** Re-read the theory if you get stuck.