a-a a-b a-c aaa aab aac aan aao aar aas aau aay ab- aba abb abc abn abo abr abs abu aby ac- aca acb acc acn aco acr acs acu acy an- ana anb anc ann ano anr ans anu any aoa aob aoc aon aoo aor aos aou ar- ara arb arc arn aro arr ars aru ary as- asa asb asc asn aso asr ass asu asy au- aua aub auc aun auo aur aus ay- aya ayc ayn ayo ayr ays ayu b-u baa bab bac ban bao bar bas bau bay bba bbb bbc bbn bbo bbr bbs bbu bby bca bcb bcc bcn bco bcr bcs bcu bcy bna bnb bnc bnn bno bnr bns bnu boa bob boc bon boo bor bos bou boy bra brb brn bro brr brs bru bry bsa bsb bsc bsn bso bsr bss bsu bsy bua bub buc bun buo bur bus buu buy by- bya byc byn byo byr bys byu c-- caa cab cac can cao car cas cau cay cba cbb cbc cbn cbo cbr cbs cbu cby cca ccb ccc ccn cco ccr ccs ccu cn- cna cnb cnc cnn cno cnr cns cnu cny co- coa cob coc con coo cor cos cou coy cra crb crc crn cro crr crs cru cry csa csb csc csn cso csr css csu csy cua cub cuc cun cuo cur cus cuu cuy cya cyb cyc cyn cyo cyr cys naa nab nac nan nao nar nas nau nay nba nbb nbc nbn nbo nbr nbs nbu nca ncb ncc ncn nco ncr ncs ncu nna nnb nnc nnn nno nns nnu no- noa nob noc non noo nor nos nou noy nra nrb nrc nrn nro nrr nrs nru nry nsa nsb nsc nsn nso nsr nss nsu nsy nua nub nuc nun nuo nur nus nuu nuy nya nyc nyn nyo nys nyu nyy oaa oab oac oan oao oar oas oau ob- oba obb obc obn obo obr obs obu oby oc- oca ocb occ ocn oco ocr ocs ocu on- ona onb onc onn ono onr ons onu ony oo- ooa oob ooc oon ooo oor oos or- ora orb orc orn oro orr ors oru ory os- osa osb osc osn oso osr oss osu ou- oua ouc oun ouo our ous oya oyo oys ra- raa rab rac ran rao rar ras rau ray rba rbb rbc rbn rbo rbr rbs rbu rca rcb rcc rcn rco rcr rcs rcu rna rnb rnc rnn rno rnr rns rnu rny roa rob roc ron roo ror ros rou roy rra rrb rrc rrn rrr rrs rru rsa rsb rsc rsn rso rsr rss rsu rua rub ruc run ruo rur rus ruu ruy ry- rya ryc ryn ryo ryr rys ryu ryy saa sab sac san sao sar sas sau say sba sbb sbc sbn sbo sbr sbs sbu sby sca scb scc scn sco scr scs scu sna snb snc snn sno snr sns snu sny soa sob soc son soo sor sos sou soy sr- sra srb src srn sro srr srs sry ss- ssa ssb ssc ssn sso ssr sss ssu sua sub suc sun suo sur sus suu suy sy- sya syb syc syn syr sys syu ua- uaa uab uac uan uao uar uas uau uay uba ubb ubc ubn ubo ubr ubs ubu uby uca ucb ucc ucn uco ucr ucs ucu un- una unb unc unn uno unr uns unu uny uoa uob uoc uon uoo uor uos ur- ura urb urc urn uro urr urs uru ury usa usb usc usn uso usr uss usu uua uuc uun uur uus uuu uyc uyo uys uyu yaa yab yac yan yao yar yas yau yay ybc ybr ybs yby yca ycc yco ycs ycu ycy yna ynn yns ynu yny yob yoc yon yoo yor yos you yoy yra yrc yrn yro yrs yru ysa ysb ysc yso ysr yss ysu ysy yua yun yuo yur yus yuu yuy yyb yyc yys yyu yyy