a-a a-b a-c aaa aab aac aad aae aah aan aao aau ab- aba abb abc abd abe abh abn abo abu ac- aca acb acc acd ace ach acn aco acu ad- ada adb adc add ade adh adn ado adu aea aeb aec aed aee aeh aen aeo aeu aha ahb ahc ahd ahe ahh ahn aho ahu an- ana anb anc and ane anh ann ano anu aoa aob aoc aod aoe aoh aon aoo aou au- aua aub auc aud aue auh aun auo b-u baa bab bac bad bae bah ban bao bau bba bbb bbc bbd bbe bbh bbn bbo bbu bca bcb bcc bcd bce bch bcn bco bcu bda bdb bdc bdd bde bdh bdo bdu be- bea beb bec bed bee beh ben beo beu bha bhb bhc bhd bhe bhh bho bhu bna bnb bnc bnd bne bnn bno bnu boa bob boc bod boe boh bon boo bou bua bub buc bud bue buh bun buo buu c-- caa cab cac cad cae cah can cao cau cba cbb cbc cbd cbe cbh cbn cbo cbu cca ccb ccc ccd cce cch ccn cco ccu cda cdb cdc cdd cde cdh cdn cdo cdu ce- cea ceb cec ced cee ceh cen ceo ceu ch- cha chb chc chd che chh chn cho chu cn- cna cnb cnc cnd cne cnh cnn cno cnu co- coa cob coc cod coe coh con coo cou cua cub cuc cud cue cuh cun cuo cuu daa dab dac dad dae dah dan dao dau dba dbb dbc dbd dbe dbh dbn dbo dbu dca dcb dcc dcd dce dcn dco dcu dda ddb ddc ddd dde ddh ddn ddo ddu de- dea deb dec ded dee deh den deo deu dh- dha dhb dhc dhd dhe dhh dho dhu dna dnb dnc dnd dne dnh dnn dno doa dob doc dod doe doh don doo dou dua dub duc dud due duh dun duo eaa eab eac ead eae eah ean eao eau eba ebb ebc ebd ebe ebh ebn ebo ebu ec- eca ecb ecc ecd ece ech ecn eco ecu ed- eda edb edc edd ede edh edn edo edu eea eeb eec eed eee een eeo eha ehb ehc ehd ehe ehh ehn eho ehu en- ena enb enc end ene enh enn eno enu eo- eoa eob eoc eod eoe eoh eon eoo eou eu- eua eub euc eud eue eun haa hab hac had hae hah han hao hau hba hbb hbc hbd hbe hbh hbn hbo hbu hca hcb hcc hcd hce hch hcn hco hda hdb hdc hdd hde hdh hdn hdo hdu he- hea heb hec hed hee heh hen heo heu hha hhb hhc hhd hhe hhh hhn hho hhu hna hnb hnc hnd hne hnh hnn hno hnu hoa hob hoc hod hoe hoh hon hoo hou hua hub huc hud hue huh hun huo huu naa nab nac nad nae nah nan nao nau nba nbb nbc nbd nbe nbn nbo nbu nca ncb ncc ncd nce nch ncn nco ncu nda ndb ndc ndd nde ndh ndn ndo ndu ne- nea neb nec ned nee neh nen neo neu nha nhb nhc nhd nhe nhh nhn nhu nna nnb nnc nne nnh nnn nno nnu no- noa nob noc nod noe noh non noo nou nua nub nuc nud nue nuh nun nuo nuu oaa oab oac oad oae oah oan oao oau ob- oba obb obc obd obe obh obn obo obu oc- oca ocb occ ocd och ocn oco ocu oda odb odc odd ode odh odn odo odu oea oeb oec oed oee oeh oen oeo oha ohc ohd ohe ohh ohn oho ohu on- ona onb onc ond one onh onn ono onu oo- ooa oob ooc ood ooh oon ooo ou- oua ouc oud oue ouh oun ouo ua- uaa uab uac uad uae uah uan uao uau uba ubb ubc ube ubh ubn ubo ubu uca ucb ucc ucd uce uch ucn uco ucu uda udb udc udd ude udn udo udu uea ueb uec ued uee ueh uen uha uhb uhc uhd uhe uhh uho uhu un- una unb unc und une unh unn uno unu uoa uob uoc uod uoe uon uoo uua uuc uue uun uuu