def rm_covered(object, pos_df, neg_df):
    """Return pos and neg dfs of examples that are not covered by object.

    Parameters
    ----------
    object : Cond, Rule, or Ruleset
        Object whose coverage predictions to invoke.
    pos_df : DataFrame
        Positive examples.
    neg_df : DataFrame
        Negative examples.

    Return
    ------
    tuple<DataFrame>
        Positive and negative examples not covered by object.
    """
    return (
        pos_df.drop(object.covers(pos_df).index, axis=0, inplace=False),
        neg_df.drop(object.covers(neg_df).index, axis=0, inplace=False),
    )