a-a a-b a-c aaa aab aac aad aan aao aar aas aau ab- aba abb abc abd abn abo abr abs abu ac- aca acb acc acd acn aco acr acs acu ad- ada adb adc add adn ado adr ads adu an- ana anb anc and ann ano anr ans anu aoa aob aoc aod aon aoo aor aos aou ar- ara arb arc ard arn aro arr ars aru as- asa asb asc asd asn aso asr ass asu au- aua aub auc aud aun auo aur aus b-u baa bab bac bad ban bao bar bas bau bba bbb bbc bbd bbn bbo bbr bbs bbu bca bcb bcc bcd bcn bco bcr bcs bcu bda bdb bdc bdd bdo bdr bds bdu bna bnb bnc bnd bnn bno bnr bns bnu boa bob boc bod bon boo bor bos bou bra brb brd brn bro brr brs bru bsa bsb bsc bsd bsn bso bsr bss bsu bua bub buc bud bun buo bur bus buu c-- caa cab cac cad can cao car cas cau cba cbb cbc cbd cbn cbo cbr cbs cbu cca ccb ccc ccd ccn cco ccr ccs ccu cda cdb cdc cdd cdn cdo cdr cds cdu cn- cna cnb cnc cnd cnn cno cnr cns cnu co- coa cob coc cod con coo cor cos cou cra crb crc crd crn cro crr crs cru csa csb csc csd csn cso csr css csu cua cub cuc cud cun cuo cur cus cuu daa dab dac dad dan dao dar das dau dba dbb dbc dbd dbn dbo dbr dbs dbu dca dcb dcc dcd dcn dco dcr dcs dcu dda ddb ddc ddd ddn ddo ddr dds ddu dna dnb dnc dnd dnn dno dnr dns doa dob doc dod don doo dor dos dou dra drb drc drd drn dro drr drs dru dsa dsb dsc dsd dsn dso dsr dss dsu dua dub duc dud dun duo dur dus naa nab nac nad nan nao nar nas nau nba nbb nbc nbd nbn nbo nbr nbs nbu nca ncb ncc ncd ncn nco ncr ncs ncu nda ndb ndc ndd ndn ndo ndr nds ndu nna nnb nnc nnn nno nns nnu no- noa nob noc nod non noo nor nos nou nra nrb nrc nrd nrn nro nrr nrs nru nsa nsb nsc nsd nsn nso nsr nss nsu nua nub nuc nud nun nuo nur nus nuu oaa oab oac oad oan oao oar oas oau ob- oba obb obc obd obn obo obr obs obu oc- oca ocb occ ocd ocn oco ocr ocs ocu oda odb odc odd odn odo odr ods odu on- ona onb onc ond onn ono onr ons onu oo- ooa oob ooc ood oon ooo oor oos or- ora orb orc ord orn oro orr ors oru os- osa osb osc osd osn oso osr oss osu ou- oua ouc oud oun ouo our ous ra- raa rab rac rad ran rao rar ras rau rba rbb rbc rbd rbn rbo rbr rbs rbu rca rcb rcc rcd rcn rco rcr rcs rcu rda rdb rdc rdd rdn rdo rdr rds rdu rna rnb rnc rnd rnn rno rnr rns rnu roa rob roc rod ron roo ror ros rou rra rrb rrc rrd rrn rrr rrs rru rsa rsb rsc rsd rsn rso rsr rss rsu rua rub ruc rud run ruo rur rus ruu saa sab sac sad san sao sar sas sau sba sbb sbc sbd sbn sbo sbr sbs sbu sca scb scc scd scn sco scr scs scu sda sdb sdc sdd sdn sdo sdr sds sdu sna snb snc snd snn sno snr sns snu soa sob soc sod son soo sor sos sou sr- sra srb src srd srn sro srr srs ss- ssa ssb ssc ssd ssn sso ssr sss ssu sua sub suc sud sun suo sur sus suu ua- uaa uab uac uad uan uao uar uas uau uba ubb ubc ubn ubo ubr ubs ubu uca ucb ucc ucd ucn uco ucr ucs ucu uda udb udc udd udn udo udr uds udu un- una unb unc und unn uno unr uns unu uoa uob uoc uod uon uoo uor uos ur- ura urb urc urd urn uro urr urs uru usa usb usc usd usn uso usr uss usu uua uuc uun uur uus uuu