Jak znaleźć duplikaty ciągów na liście funkcji String Python

sam_list = [11, 13, 15, 16, 13, 15, 16, 11] 

print ("The list is: " + str(sam_list)) 

# to remove duplicates from list 

result = [] 

[result.append(x) for x in sam_list if x not in result] 

# printing list after removal 

print ("The list after removing duplicates: " + str(result))
Mercy Wacera