a-a a-b aaa aab aad aan aao aar aas aau ab- aba abb abd abn abo abr abs abu ad- ada adb add adn ado adr ads adu an- ana anb and ann ano anr ans anu aoa aob aod aon aoo aor aos aou ar- ara arb ard arn aro arr ars aru as- asa asb asd asn aso asr ass asu au- aua aub aud aun auo aur aus b-u baa bab bad ban bao bar bas bau bba bbb bbd bbn bbo bbr bbs bbu bda bdb bdd bdo bdr bds bdu bna bnb bnd bnn bno bnr bns bnu boa bob bod bon boo bor bos bou bra brb brd brn bro brr brs bru bsa bsb bsd bsn bso bsr bss bsu bua bub bud bun buo bur bus buu daa dab dad dan dao dar das dau dba dbb dbd dbn dbo dbr dbs dbu dda ddb ddd ddn ddo ddr dds ddu dna dnb dnd dnn dno dnr dns doa dob dod don doo dor dos dou dra drb drd drn dro drr drs dru dsa dsb dsd dsn dso dsr dss dsu dua dub dud dun duo dur dus naa nab nad nan nao nar nas nau nba nbb nbd nbn nbo nbr nbs nbu nda ndb ndd ndn ndo ndr nds ndu nna nnb nnn nno nns nnu no- noa nob nod non noo nor nos nou nra nrb nrd nrn nro nrr nrs nru nsa nsb nsd nsn nso nsr nss nsu nua nub nud nun nuo nur nus nuu oaa oab oad oan oao oar oas oau ob- oba obb obd obn obo obr obs obu oda odb odd odn odo odr ods odu on- ona onb ond onn ono onr ons onu oo- ooa oob ood oon ooo oor oos or- ora orb ord orn oro orr ors oru os- osa osb osd osn oso osr oss osu ou- oua oud oun ouo our ous ra- raa rab rad ran rao rar ras rau rba rbb rbd rbn rbo rbr rbs rbu rda rdb rdd rdn rdo rdr rds rdu rna rnb rnd rnn rno rnr rns rnu roa rob rod ron roo ror ros rou rra rrb rrd rrn rrr rrs rru rsa rsb rsd rsn rso rsr rss rsu rua rub rud run ruo rur rus ruu saa sab sad san sao sar sas sau sba sbb sbd sbn sbo sbr sbs sbu sda sdb sdd sdn sdo sdr sds sdu sna snb snd snn sno snr sns snu soa sob sod son soo sor sos sou sr- sra srb srd srn sro srr srs ss- ssa ssb ssd ssn sso ssr sss ssu sua sub sud sun suo sur sus suu ua- uaa uab uad uan uao uar uas uau uba ubb ubn ubo ubr ubs ubu uda udb udd udn udo udr uds udu un- una unb und unn uno unr uns unu uoa uob uod uon uoo uor uos ur- ura urb urd urn uro urr urs uru usa usb usd usn uso usr uss usu uua uun uur uus uuu