def postprocess_label(labels: list[str]) -> str:
    """
    Creates a label string with the format
    "Partially generated by [label1] and [label2] and ...".
    Removes duplicate labels while preserving the original order.

    Args:
        labels: A list of strings representing labels.

    Returns:
        A string with the formatted label.
    """
    labels = list(set(labels))
    label = "Partially generated by "
    if len(label) == 1:
        label += labels[0]
    elif len(labels) == 2:
        label += f"{labels[0]} and {labels[1]}"
    else:
        combination = ", ".join(labels[0 : len(labels) - 1])
        label += f"{combination}, and {labels[-1]}"
    return label


labels = ["gpt-4o", "gpt-4o-mini", "gpt-4o-l"]
postprocessed_label = postprocess_label(labels)
print(postprocessed_label)