a-a a-b a-c aaa aab aac aad aah aan aau ab- aba abb abc abd abh abn abu ac- aca acb acc acd ach acn acu ad- ada adb adc add adh adn adu aha ahb ahc ahd ahh ahn ahu an- ana anb anc and anh ann anu au- aua aub auc aud auh aun b-u baa bab bac bad bah ban bau bba bbb bbc bbd bbh bbn bbu bca bcb bcc bcd bch bcn bcu bda bdb bdc bdd bdh bdu bha bhb bhc bhd bhh bhu bna bnb bnc bnd bnn bnu bua bub buc bud buh bun buu c-- caa cab cac cad cah can cau cba cbb cbc cbd cbh cbn cbu cca ccb ccc ccd cch ccn ccu cda cdb cdc cdd cdh cdn cdu ch- cha chb chc chd chh chn chu cn- cna cnb cnc cnd cnh cnn cnu cua cub cuc cud cuh cun cuu daa dab dac dad dah dan dau dba dbb dbc dbd dbh dbn dbu dca dcb dcc dcd dcn dcu dda ddb ddc ddd ddh ddn ddu dh- dha dhb dhc dhd dhh dhu dna dnb dnc dnd dnh dnn dua dub duc dud duh dun haa hab hac had hah han hau hba hbb hbc hbd hbh hbn hbu hca hcb hcc hcd hch hcn hda hdb hdc hdd hdh hdn hdu hha hhb hhc hhd hhh hhn hhu hna hnb hnc hnd hnh hnn hnu hua hub huc hud huh hun huu naa nab nac nad nah nan nau nba nbb nbc nbd nbn nbu nca ncb ncc ncd nch ncn ncu nda ndb ndc ndd ndh ndn ndu nha nhb nhc nhd nhh nhn nhu nna nnb nnc nnh nnn nnu nua nub nuc nud nuh nun nuu ua- uaa uab uac uad uah uan uau uba ubb ubc ubh ubn ubu uca ucb ucc ucd uch ucn ucu uda udb udc udd udn udu uha uhb uhc uhd uhh uhu un- una unb unc und unh unn unu uua uuc uun uuu