a-a a-b aaa aab aag aan aao aar aas aau aax ab- aba abb abg abn abo abr abs abu abx ag- aga agb agg agn ago agr ags agu agx an- ana anb ang ann ano anr ans anu anx aoa aob aog aon aoo aor aos aou aox ar- ara arb arg arn aro arr ars aru arx as- asa asb asg asn aso asr ass asu asx au- aua aub aug aun auo aur aus aux ax- axa axn axo axr axs axx b-u baa bab bag ban bao bar bas bau bax bba bbb bbg bbn bbo bbr bbs bbu bbx bga bgb bgg bgn bgo bgr bgs bgu bgx bna bnb bng bnn bno bnr bns bnu bnx boa bob bog bon boo bor bos bou box bra brb brg brn bro brr brs bru brx bsa bsb bsg bsn bso bsr bss bsu bsx bua bub bug bun buo bur bus buu bux bxb bxn bxo bxx gaa gab gag gan gao gar gas gau gba gbg gbn gbo gbr gbs gbu gbx gga ggb ggg ggn ggo ggr ggs ggu gna gnb gnn gno gnr gns gnu goa gob gog gon goo gor gos gou gox gra grb grg grn gro grr grs gru grx gsa gsb gsg gsn gso gsr gss gsu gsx gu- gua gub gug gun guo gur gus guu gxa gxs naa nab nag nan nao nar nas nau nax nba nbb nbg nbn nbo nbr nbs nbu nbx nga ngb ngg ngn ngo ngs ngu nna nnb nng nnn nno nns nnu no- noa nob nog non noo nor nos nou nox nra nrb nrg nrn nro nrr nrs nru nrx nsa nsb nsg nsn nso nsr nss nsu nsx nua nub nug nun nuo nur nus nuu nux oaa oab oag oan oao oar oas oau oax ob- oba obb obg obn obo obr obs obu obx oga ogg ogn ogo ogs ogx on- ona onb ong onn ono onr ons onu onx oo- ooa oob oog oon ooo oor oos oox or- ora orb org orn oro orr ors oru orx os- osa osb osg osn oso osr oss osu osx ou- oua oun ouo our ous ox- oxa oxb oxn oxo oxx ra- raa rab rag ran rao rar ras rau rax rba rbb rbg rbn rbo rbr rbs rbu rbx rga rgb rgg rgn rgo rgr rgs rgx rna rnb rng rnn rno rnr rns rnu roa rob rog ron roo ror ros rou rox rra rrb rrg rrn rrr rrs rru rsa rsb rsg rsn rso rsr rss rsu rsx rua rub rug run ruo rur rus ruu rux rxr rxs saa sab sag san sao sar sas sau sax sba sbb sbg sbn sbo sbr sbs sbu sbx sga sgb sgg sgn sgo sgr sgs sgu sgx sna snb sng snn sno snr sns snu soa sob sog son soo sor sos sou sox sr- sra srb srg srn sro srr srs srx ss- ssa ssb ssg ssn sso ssr sss ssu ssx sua sub sug sun suo sur sus suu sux sxn sxs sxu ua- uaa uab uag uan uao uar uas uau uba ubb ubg ubn ubo ubr ubs ubu ubx uga ugb ugg ugn ugo ugr ugs ugu ugx un- una unb ung unn uno unr uns unu unx uoa uob uog uon uoo uor uos uox ur- ura urb urg urn uro urr urs uru urx usa usb usg usn uso usr uss usu usx uua uug uun uur uus uuu uxb uxo uxr uxu xaa xag xan xar xas xau xbr xbx xna xno xns xnu xoa xog xon xoo xor xos xox xrx xsa xsb xss xun xus xxo xxx