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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def delete_duplicates(seq):
 """ Remove duplicates from an iterable, preserving the order. Args: seq: Iterable of various type. Returns: list: List of unique objects. """

    seen = set()
    seen_add = seen.add
    return [x for x in seq if not (x in seen or seen_add(x))]