def METHOD_NAME(subj_type, lists):
    rs = None
    if 'mixed_gender' in subj_type:
        if subj_type == 'mixed_gender':
            rs = lists.get_mixed_gender_pairs(f_file='female', m_file='male', add_flip=True)
        elif subj_type.startswith('mixed_gender_'):
            suffix = subj_type.split('mixed_gender_')[1]
            rs = lists.get_mixed_gender_pairs(f_file='female_'+suffix, m_file='male_'+suffix, add_flip=True)
    else:
        if subj_type in lists.subjects:
            rs = lists.METHOD_NAME(subj_type, add_flip=True)
        else:
            rs = lists.get_people_pairs(subj_type, add_flip=True)
    return rs