a-do aaaa aaac aaad aaaf aaca aacc aacd aacf aaco aada aadc aafa aafc aafd aaff aaoo acaa acac acad acca accc accd accf acco acda acdc acdf acfc acfd acoa acod adaa adac adad adao adcc adda addc addd addo adfa adfc adoc adod adoo afaa afad afao afca afcc afdc affa affc affo afoa afoo aoca c-cd caaa caac caaf cac- caca cacc caco cada cadc cadd cado cafa cafc caff caod ccaa ccac ccad ccaf ccca cccc cccf ccdc ccdf ccfa ccfc ccfd ccff ccoc ccod cdaa cdac cdad cdda cdfa cfaa cfac cfao cfca cfcf cfco cfda cfoa coad coca coco coda codd cofc coff cood coof daad daca dada dado dafa dafc daff dafo dcca dccc dcfc dddd ddoc dfaf dfcc dfco dffa doca doco dod- doda dodd dodo doff dood doof faaa faac faad faca facc fada fadd fado fafa fafc faff fafo fcca fccf fcda fdca fdoa fdoc ffcc ffff foad foaf foca foco foda fofo food foof oafc oafo ocac ocad occa occc ocfa odac odda oddd odoo off- offa offc offo ooaa ooda ooff oooo