i am trying to delete duplicate words from python, everything works, but "Kate" word is still duplicated. help me
def custom_function(list):
sia = []
for item in list:
    sia.append(item.capitalize())
for word in sia:
    while sia.count(word) != 1:
        sia.remove(word)
        if sia.count(word) == 1:
            break
return sia
unknown_list = ["toby", "James", "kate", "George", "James", "rick", "Alex", 
"Jein", "Alex", "Alex","George", "Jein", "kate", "medelin"]
print(custom_function(unknown_list))
 
    