How do you remove duplicates from an array?

In python it is simple program

list = [1,3,4,6,3,1,8,9,6]

print (“The original list is : “ + str(list))

list1 = []

for i in list:

if i not in list1:

list.append(i)

print (“The list after removing duplicates : “ + str(list1))

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How do you remove duplicates from an array?