diff --git a/08_mfr/00_content.ipynb b/08_mfr/00_content.ipynb
index 4cf1aa7..1884515 100644
--- a/08_mfr/00_content.ipynb
+++ b/08_mfr/00_content.ipynb
@@ -329,7 +329,11 @@
   {
    "cell_type": "code",
    "execution_count": 11,
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "fragment"
+    }
+   },
    "outputs": [
     {
      "data": {
diff --git a/08_mfr/01_content.ipynb b/08_mfr/01_content.ipynb
index 2cf8720..688d953 100644
--- a/08_mfr/01_content.ipynb
+++ b/08_mfr/01_content.ipynb
@@ -700,7 +700,11 @@
   {
    "cell_type": "code",
    "execution_count": 19,
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "fragment"
+    }
+   },
    "outputs": [],
    "source": [
     "from functools import reduce"
@@ -711,7 +715,7 @@
    "execution_count": 20,
    "metadata": {
     "slideshow": {
-     "slide_type": "fragment"
+     "slide_type": "-"
     }
    },
    "outputs": [