a-a a-b aaa aab aad aan aao aav aay ab- aba abb abd abn abo abv aby ad- ada adb add adn ado adv ady an- ana anb and ann ano anv any aoa aob aod aon aoo aov av- ava avb avd avn avo avy ay- aya ayd ayn ayo baa bab bad ban bao bav bay bba bbb bbd bbn bbo bby bda bdb bdd bdo bdv bdy bna bnb bnd bnn bno bnv boa bob bod bon boo bov boy bva bvb bvd bvn bvo bvv by- bya byd byn byo daa dab dad dan dao dav day dba dbb dbd dbn dbo dbv dby dda ddb ddd ddn ddo ddy dna dnb dnd dnn dno dny doa dob dod don doo dov doy dva dvb dvd dvn dy- dya dyb dyd dyn dyo dyy naa nab nad nan nao nav nay nba nbb nbd nbn nbo nbv nda ndb ndd ndn ndo ndv ndy nna nnb nnn nno nnv no- noa nob nod non noo nov noy nva nvb nvd nvn nvv nya nyd nyn nyo nyy oaa oab oad oan oao oav ob- oba obb obd obn obo obv oby oda odb odd odn odo odv on- ona onb ond onn ono ony oo- ooa oob ood oon ooo oov ov- ova ovb ovd ovo ovv oya oyd oyo v-a vaa vab vad van vao vav vay vba vbd vbo vbv vdb vdd vdo vdv vn- vna vnd vno vnv voa vob vod von voo vov voy vva vvb vvo vvv vyd vyn yaa yab yad yan yao yav yay yby yda ydn ydo ydy yna ynd ynn yny yob yod yon yoo yoy yva yvo yvy yyb yyy