-vac a-ii a-iv aaaa aaab aaac aaai aaav aaba aabb aabc aabi aaca aacb aacc aaci aacv aaib aaic aaii aava abaa abab abac abai abb- abba abbb abbi abca abcb abcc abci abia abib abic abva acaa acab acac acai acba acca accc acci aci- acia acic acvv aiai aiba aica aicc aiia aiib aiic aiva avab avcc avia avic aviv avva ba-i baaa baba babb babi bac- baca bacc baci baia baib baic bava bavi bbbb bbci bcaa bcbc bcca bccc bcci bcia biba bibb bibi bica bicc bici bivi caaa caab caac caba cabi cac- caca cacc caci caia caib caic cava cavi cbac cbbc cbca cbcc cbia cbva cbvb ccaa ccab ccac ccai ccba ccbc ccca cccb cccc ccci cccv ccic ccii cciv ccvi ciaa ciba cibc cibi cica cicc cici ciia ciii civa civc cvac cvca cvcc cvii iaaa iaac iaai iaba iaca iacc iaia iava ibac ibca ibia icaa icab icac icai icbc icca iccb iccc icci iiac iica iiii ivai ivbv ivic vaca vaia vava vbcc vcbi vcci vic- vica vici viii viva vivi vvvv