def removeDuplicates(li: list) -> list:
    """
    Removes Duplicates from bookmark file

    Args:
        li(list): list of bookmark entries

    Returns:
        list: filtered bookmark entries
    """
    visited = set()
    output = []
    for a, b in li:
        if a not in visited:
            visited.add(a)
            output.append((a, b))
    return output