def remove_duplicate_QUBO(QUBO_storage):
    """
    De-duplicates the QUBO storage list

    Parameters
    ----------
    QUBO_storage : list
        List of QUBOs (each QUBO is a dictionary).

    Returns
    -------
    unique : list
        de-duplicated list.

    """
    unique = []
    for a in QUBO_storage:
        if a not in unique:
            unique.append(a)
    return unique