make variable names unique

Author: xlt208

samples/04_gis_analysts_data_scientists/calculate_post_fire_landslide_risk.ipynb

@@ -220,8 +220,8 @@
     "map2.layout = Layout(flex=\"1 1\", height=\"500px\", padding=\"10px\")\n",
     "map1.content.add(infrared_before)\n",
     "map2.content.add(infrared_after)\n",
-    "box = HBox([map1, map2])\n",
-    "box"
+    "box1 = HBox([map1, map2])\n",
+    "box1"
    ]
   },
   {
@@ -644,17 +644,13 @@
    "source": [
     "# Create three maps to compare before and after imageries\n",
     "# and the landslide risk map side by side\n",
-    "map1 = gis.map(location=\"-122.58, 38.45\")\n",
-    "map2 = gis.map(location=\"-122.58, 38.45\")\n",
     "map3 = gis.map(location=\"-122.58, 38.45\")\n",
     "map1.layout = Layout(flex=\"1 1\", height=\"500px\", padding=\"5px\")\n",
     "map2.layout = Layout(flex=\"1 1\", height=\"500px\", padding=\"5px\")\n",
     "map3.layout = Layout(flex=\"1 1\", height=\"500px\", padding=\"5px\")\n",
-    "map1.content.add(infrared_before)\n",
-    "map2.content.add(infrared_after)\n",
     "map3.content.add(landslide_risk)\n",
-    "box = HBox([map1, map2, map3])\n",
-    "box"
+    "box2 = HBox([map1, map2, map3])\n",
+    "box2"
    ]
   },
   {