diff --git a/ebkTools.go b/ebkTools.go
index d1f4727..9534c3f 100755
--- a/ebkTools.go
+++ b/ebkTools.go
@@ -215,6 +215,19 @@ func StringsDiff(a, b []string) (diff []string) {
 	return
 }
 
+//https://www.golangprograms.com/remove-duplicate-values-from-slice.html
+func SliceIntUnique(intSlice []int) []int {
+	keys := make(map[int]bool)
+	list := []int{}
+	for _, entry := range intSlice {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
+		}
+	}
+	return list
+}
+
 func GeneratorUmlaufListe(start, ende, einsprung int) (umlaufliste []int) {
 	for i := einsprung; i <= ende; i++ {
 		umlaufliste = append(umlaufliste, i)