-vac a-do aaaa aaac aaad aaav aaca aacc aacd aaco aacv aada aadc aaoo aava acaa acac acad acca accc accd acco acda acdc acoa acod acvv adaa adac adad adao adcc adda addc addd addo adoc adod adoo aoca avao avcc avco avda avva avvo c-cd caaa caac cac- caca cacc caco cada cadc cadd cado caod cava cavo ccaa ccac ccad ccca cccc cccv ccdc ccoc ccod ccvo cdaa cdac cdad cdda cdvd coad coca coco coda codd cood cova covo cvac cvca cvcc daad daca dada dado dava dcca dccc dccv dcvd dddd ddoc doca doco dod- doda dodd dodo dood dvda dvoa ocac ocad occa occc odac odda oddd odoo odva ooaa ooda oooo ovda ovo- ovod ovoo vaad vaca vaco vada vado vava vdcc voad voca voda vodo vooc vvvv