diff --git a/20230426/knirps.red b/20230426/knirps.red
new file mode 100644
index 0000000000000000000000000000000000000000..befaa2a3da9a8cab5e76207623ac49880453b472
--- /dev/null
+++ b/20230426/knirps.red
@@ -0,0 +1,5 @@
+;name Knirps
+;assert 1
+
+start   mov 0, 1
+        end start
diff --git a/20230426/nothing.red b/20230426/nothing.red
new file mode 100644
index 0000000000000000000000000000000000000000..5d6f3c21f2f19c3929c675c21b1e9a8ff47d8bf1
--- /dev/null
+++ b/20230426/nothing.red
@@ -0,0 +1,5 @@
+;name Nothing
+;assert 1
+
+start    jmp 0
+         end start
diff --git a/20230426/rtech-20230426.pdf b/20230426/rtech-20230426.pdf
index 25e17719d8fa82f576e9eecc705f5e21ba72c39d..471d62c33a9abeb9d672e517067ce3e6572d3d07 100644
Binary files a/20230426/rtech-20230426.pdf and b/20230426/rtech-20230426.pdf differ
diff --git a/20230426/rtech-20230426.tex b/20230426/rtech-20230426.tex
index 368034f2f2290ec6775d3f84a6f3d38c7ac4525b..d04cd7d24264af8821f33fcb0ecf5a1d0949e1f7 100644
--- a/20230426/rtech-20230426.tex
+++ b/20230426/rtech-20230426.tex
@@ -272,6 +272,8 @@
 
 \end{frame}
 
+\iffalse
+
 \begin{frame}[fragile]
 
   \showsubsection
@@ -445,6 +447,8 @@
 
 \end{frame}
 
+\fi
+
 \begin{frame}[fragile]
 
   \showsubsection