human
list drop duplicate and keep the original sequence.
assistant
Here is a Python program to return a list drop duplicate and keep the original sequence

import copy

def drop_duplicates(seq):
        """
        Drops duplicate elements from a sequence.
        """
        seen = set()
        seen_add = seen.add
        return [x for x in seq if not (x in seen or seen_add(x))]

# Enter the list
list1 = [1, 2, 3, 4, 5, 6, 7, 8, 9]

# Enter the list
list2 = [1, 2, 3, 4, 5, 6, 7, 8, 9]

# Calling the function
list3 = drop_duplicates(list1)

# Printing the list
print(list3)

#Example Output
# [1, 2, 3, 4, 5, 6, 7, 8, 9]

#Remember to inspect code for bugs.