diff --git a/borman-exercise-3-11.ipynb b/borman-exercise-3-11.ipynb
index cbd6a5c..ed75998 100644
--- a/borman-exercise-3-11.ipynb
+++ b/borman-exercise-3-11.ipynb
@@ -83,14 +83,21 @@
     "import cantera as ct\n",
     "\n",
     "# Get all of the Species objects defined in the GRI 3.0 mechanism\n",
-    "species = {S.name: S for S in ct.Species.listFromFile('gri30.cti')}\n",
+    "species = {}\n",
+    "for S in ct.Species.listFromFile('gri30.cti'):\n",
+    "    species[S.name] = S\n",
     "\n",
     "# Create an IdealGas object with selected species\n",
-    "complete_species = [species[S] for S in (str.split(' H2 CO H2O '))]\n",
+    "complete_species = []\n",
+    "for Sname in (str.split(' H2 CO H2O ')):\n",
+    "    complete_species.append(species[Sname])\n",
+    "\n",
     "steam = ct.Solution(thermo='IdealGas', species=complete_species)\n",
     "\n",
+    "# Load Solid Carbon phase\n",
     "carbon = ct.Solution('graphite.cti')\n",
     "\n",
+    "# Create an Mixture object with gas and solid phases\n",
     "mix = ct.Mixture([steam, carbon])\n",
     "\n",
     "mix()"