diff --git a/chartpy/dashboard/sessionmanager.py b/chartpy/dashboard/sessionmanager.py
index cfbb796..a01ffad 100644
--- a/chartpy/dashboard/sessionmanager.py
+++ b/chartpy/dashboard/sessionmanager.py
@@ -473,12 +473,9 @@ def create_calculated_flags(self, prefix, lst=None, lst2=None):
 
         if lst2 is None:
             return lst
-
-        lst3 = []
-
-        for i in lst2:
-            for j in lst:
-                lst3.append(j + '-' + i)
+        
+        lst3 = [j + '-' + i for i in lst2 for j in lst]
+        
 
         return lst3
 
@@ -505,4 +502,4 @@ def flatten_list_of_lists(self, list_of_lists):
 
             return rt
 
-        return list_of_lists
\ No newline at end of file
+        return list_of_lists