diff --git a/samples/presentation/examples/example_composition_test.go b/samples/presentation/examples/example_composition_test.go
index e601688..ad48785 100644
--- a/samples/presentation/examples/example_composition_test.go
+++ b/samples/presentation/examples/example_composition_test.go
@@ -22,10 +22,6 @@ import (
 	F "github.com/IBM/fp-go/function"
 )
 
-func main() {
-
-}
-
 func Example_composition_pipe() {
 
 	filter := func(i int) bool {
diff --git a/samples/presentation/introduction.pptx b/samples/presentation/introduction.pptx
index 7ee2672..6c1042d 100644
Binary files a/samples/presentation/introduction.pptx and b/samples/presentation/introduction.pptx differ