diff --git a/truth_table1.txt b/truth_table1.txt
new file mode 100644
index 0000000..e9b3ef8
--- /dev/null
+++ b/truth_table1.txt
@@ -0,0 +1,12 @@
+DEF TRUTH_TABLE1
+  PORT IN A
+  PORT IN B
+  PORT OUT Z
+
+  NET BN
+  NET ZN
+
+  INST NOT1 NAND B B BN
+  INST NAND1 NAND A BN ZN
+  INST NOT2 NAND ZN ZN Z
+ENDDEF