diff --git a/examples/a-portentaH7-examples/a-b-utilities/a-b-c-efficient-dual-core/a-b-c-efficient-dual-core.ino b/examples/a-portentaH7-examples/a-b-utilities/a-b-c-efficient-dual-core/a-b-c-efficient-dual-core.ino
new file mode 100644
index 0000000..f1be34d
--- /dev/null
+++ b/examples/a-portentaH7-examples/a-b-utilities/a-b-c-efficient-dual-core/a-b-c-efficient-dual-core.ino
@@ -0,0 +1,30 @@
+// Efficient Dual Core program setup
+// Good if lots of the code is duplicated
+// If uploaded to the M7 Core erases what was on it and boots the M4 core
+// If uploaded to the M4 Core erases what was on it.
+
+//////////////////// Mixed M7 and M4 Core Programing /////////////////////
+
+void setup() {
+   
+  #ifdef CORE_CM7  
+     bootM4();
+  #endif
+  
+  #ifdef CORE_CM4  
+    // only M4 here
+  #endif 
+   
+}
+
+void loop() {
+  
+  #ifdef CORE_CM7  
+    // only M7 Here
+  #endif
+  
+  #ifdef CORE_CM4  
+    // only M4 here
+  #endif  
+  
+}