a-a a-b a-c aaa aab aac aad aah aak aan aao aar aau ab- aba abb abc abd abh abk abn abo abr abu ac- aca acb acc acd ach ack acn aco acr acu ad- ada adb adc add adh adk adn ado adr adu aha ahb ahc ahd ahh ahk ahn aho ahr ahu aka akb akc akd akh akk akn ako akr aku an- ana anb anc and anh ank ann ano anr anu aoa aob aoc aod aoh aok aon aoo aor aou ar- ara arb arc ard arh ark arn aro arr aru au- aua aub auc aud auh auk aun auo aur b-u baa bab bac bad bah bak ban bao bar bau bba bbb bbc bbd bbh bbk bbn bbo bbr bbu bca bcb bcc bcd bch bck bcn bco bcr bcu bda bdb bdc bdd bdh bdk bdo bdr bdu bha bhb bhc bhd bhh bhk bho bhr bhu bka bkb bkc bkk bkn bko bkr bna bnb bnc bnd bnk bnn bno bnr bnu boa bob boc bod boh bok bon boo bor bou bra brb brd brh brk brn bro brr bru bua bub buc bud buh buk bun buo bur buu c-- caa cab cac cad cah cak can cao car cau cba cbb cbc cbd cbh cbk cbn cbo cbr cbu cca ccb ccc ccd cch cck ccn cco ccr ccu cda cdb cdc cdd cdh cdk cdn cdo cdr cdu ch- cha chb chc chd chh chk chn cho chr chu cka ckb ckc ckd ckh cko cn- cna cnb cnc cnd cnh cnn cno cnr cnu co- coa cob coc cod coh cok con coo cor cou cra crb crc crd crh crk crn cro crr cru cua cub cuc cud cuh cuk cun cuo cur cuu daa dab dac dad dah dak dan dao dar dau dba dbb dbc dbd dbh dbk dbn dbo dbr dbu dca dcb dcc dcd dck dcn dco dcr dcu dda ddb ddc ddd ddh ddk ddn ddo ddr ddu dh- dha dhb dhc dhd dhh dhk dho dhr dhu dka dkb dkc dkk dko dkr dku dna dnb dnc dnd dnh dnk dnn dno dnr doa dob doc dod doh dok don doo dor dou dra drb drc drd drk drn dro drr dru dua dub duc dud duh duk dun duo dur haa hab hac had hah hak han hao har hau hba hbb hbc hbd hbh hbk hbn hbo hbr hbu hca hcb hcc hcd hch hck hcn hco hcr hda hdb hdc hdd hdh hdk hdn hdo hdr hdu hha hhb hhc hhd hhh hhk hhn hho hhr hhu hka hkb hkd hkh hkk hkn hko hkr hku hna hnb hnc hnd hnh hnk hnn hno hnu hoa hob hoc hod hoh hok hon hoo hor hou hr- hra hrb hrc hrd hrh hrk hrn hro hrr hru hua hub huc hud huh huk hun huo hur huu ka- kaa kab kac kad kah kak kan kao kar kau kba kbb kbc kbd kbh kbk kbn kbo kbr kbu kca kcb kcc kcd kch kck kcn kcr kcu kda kdb kdc kdh kdk kdo kdr kdu kha khh khk khn kho khr khu kkb kkc kkh kkk kkn kkr kku kn- kna knc knd knk knn kno knr knu koa kob koc kod koh kok kon koo kor kou kra krc krd krk krn kro krr kru kub kuc kud kuh kuk kun kur kuu naa nab nac nad nah nak nan nao nar nau nba nbb nbc nbd nbk nbn nbo nbr nbu nca ncb ncc ncd nch nck ncn nco ncr ncu nda ndb ndc ndd ndh ndk ndn ndo ndr ndu nha nhb nhc nhd nhh nhk nhn nhr nhu nka nkc nkk nkn nko nkr nku nna nnb nnc nnh nnk nnn nno nnu no- noa nob noc nod noh nok non noo nor nou nra nrb nrc nrd nrk nrn nro nrr nru nua nub nuc nud nuh nuk nun nuo nur nuu oaa oab oac oad oah oak oan oao oar oau ob- oba obb obc obd obh obk obn obo obr obu oc- oca ocb occ ocd och ock ocn oco ocr ocu oda odb odc odd odh odn odo odr odu oha ohc ohd ohh ohn oho ohr ohu oka okb okc okd okk oko okr oku on- ona onb onc ond onh onk onn ono onr onu oo- ooa oob ooc ood ooh ook oon ooo oor or- ora orb orc ord orh ork orn oro orr oru ou- oua ouc oud ouh ouk oun ouo our ra- raa rab rac rad rah rak ran rao rar rau rba rbb rbc rbd rbh rbk rbn rbo rbr rbu rca rcb rcc rcd rch rcn rco rcr rcu rda rdb rdc rdd rdh rdn rdo rdr rdu rh- rha rhb rhc rhd rhh rhn rho rhr rhu rkb rkc rkk rko rku rna rnb rnc rnd rnh rnn rno rnr rnu roa rob roc rod roh rok ron roo ror rou rra rrb rrc rrd rrh rrk rrn rrr rru rua rub ruc rud ruh ruk run ruo rur ruu ua- uaa uab uac uad uah uak uan uao uar uau uba ubb ubc ubh ubk ubn ubo ubr ubu uca ucb ucc ucd uch uck ucn uco ucr ucu uda udb udc udd udk udn udo udr udu uha uhb uhc uhd uhh uho uhr uhu uka ukb ukc ukk ukn ukr uku un- una unb unc und unh unk unn uno unr unu uoa uob uoc uod uok uon uoo uor ur- ura urb urc urd urk urn uro urr uru uua uuc uun uur uuu