diff --git a/exercises/Exercise4.ipynb b/exercises/Exercise4.ipynb
index ad34513..0a86d20 100644
--- a/exercises/Exercise4.ipynb
+++ b/exercises/Exercise4.ipynb
@@ -96,8 +96,8 @@
     "operators are a valid choice if they satisfy the following conditions.\n",
     "\n",
     "1. Logical Pauli operators must commute with all stabilizers.\n",
-    "2. Logical Pauli operators for the same logical qubit anticommute: $\\left[ X_j, Z_j \\right] = 0$.\n",
-    "3. Logical Pauli operators for different logical qubits commute: $\\{ X_j, Z_j \\} = 0$."
+    "2. Logical Pauli operators for the same logical qubit anticommute: $\\{ X_j, Z_j \\} = 0$.\n",
+    "3. Logical Pauli operators for different logical qubits commute: $\\left[ X_j, Z_j \\right] = 0$."
    ]
   },
   {