a-a a-b a-i aaa aab aai aan aao aar aas aau ab- aba abb abi abn abo abr abs abu ai- aia aib aii ain aio air ais aiu an- ana anb ani ann ano anr ans anu aoa aob aoi aon aoo aor aos aou ar- ara arb ari arn aro arr ars aru as- asa asb asi asn aso asr ass asu au- aua aub aui aun auo aur aus b-u baa bab bai ban bao bar bas bau bba bbb bbi bbn bbo bbr bbs bbu bi- bia bib bii bin bio bir bis biu bna bnb bni bnn bno bnr bns bnu boa bob boi bon boo bor bos bou bra brb bri brn bro brr brs bru bsa bsb bsi bsn bso bsr bss bsu bua bub bui bun buo bur bus buu ia- iaa iab iai ian iao iar ias iau iba ibb ibi ibn ibo ibr ibs ibu iia iib iii iin iio iir iis iiu in- ina inb ini inn ino inr ins inu io- ioa iob ioi ion ioo ior ios iou ir- ira irb iri irn iro irr irs iru is- isa isb isi isn iso isr iss isu iu- iua iub iui iur ius n-i naa nab nai nan nao nar nas nau nba nbb nbi nbn nbo nbr nbs nbu nia nib nii nin nio nir nis niu nna nnb nni nnn nno nns nnu no- noa nob noi non noo nor nos nou nra nrb nri nrn nro nrr nrs nru nsa nsb nsi nsn nso nsr nss nsu nua nub nui nun nuo nur nus nuu o-i oaa oab oai oan oao oar oas oau ob- oba obb obi obn obo obr obs obu oia oib oii oin oio oir ois oiu on- ona onb oni onn ono onr ons onu oo- ooa oob ooi oon ooo oor oos or- ora orb ori orn oro orr ors oru os- osa osb osi osn oso osr oss osu ou- oua oui oun ouo our ous ra- raa rab rai ran rao rar ras rau rba rbb rbi rbn rbo rbr rbs rbu ria rib rii rin rio rir ris rna rnb rni rnn rno rnr rns rnu roa rob roi ron roo ror ros rou rra rrb rri rrn rrr rrs rru rsa rsb rsi rsn rso rsr rss rsu rua rub rui run ruo rur rus ruu saa sab sai san sao sar sas sau sba sbb sbi sbn sbo sbr sbs sbu sia sib sii sin sio sir sis siu sna snb sni snn sno snr sns snu soa sob soi son soo sor sos sou sr- sra srb sri srn sro srr srs ss- ssa ssb ssi ssn sso ssr sss ssu sua sub sui sun suo sur sus suu ua- uaa uab uai uan uao uar uas uau uba ubb ubi ubn ubo ubr ubs ubu uia uib uii uin uio uir uis uiu un- una unb uni unn uno unr uns unu uoa uob uon uoo uor uos ur- ura urb uri urn uro urr urs uru usa usb usi usn uso usr uss usu uua uun uur uus uuu