a-a a-b aaa aab aad aam aan aao aar aau ab- aba abb abd abm abn abo abr abu ad- ada adb add adm adn ado adr adu ama amb amd amm amn amo amr amu an- ana anb and anm ann ano anr anu aoa aob aod aom aon aoo aor aou ar- ara arb ard arm arn aro arr aru au- aua aub aud aum aun auo aur b-u baa bab bad bam ban bao bar bau bba bbb bbd bbm bbn bbo bbr bbu bda bdb bdd bdm bdo bdr bdu bma bmb bmd bmm bmn bmo bmr bmu bna bnb bnd bnn bno bnr bnu boa bob bod bom bon boo bor bou bra brb brd brm brn bro brr bru bua bub bud bum bun buo bur buu daa dab dad dam dan dao dar dau dba dbb dbd dbm dbn dbo dbr dbu dda ddb ddd ddm ddn ddo ddr ddu dma dmb dmd dmm dmn dmo dmr dmu dna dnb dnd dnm dnn dno dnr doa dob dod dom don doo dor dou dra drb drd drm drn dro drr dru dua dub dud dum dun duo dur m-o m-r maa mab mad mam man mao mar mau mba mbb mbd mbm mbo mbr mbu mda mdb mdd mdm mdn mdo mdr mdu mma mmb mmd mmm mmn mmo mmr mmu mna mnb mnm mnn mno mnr mnu moa mob mod mom mon moo mor mou mra mrb mrd mrm mrn mro mrr mru mua mub mud mum mun mur muu naa nab nad nam nan nao nar nau nba nbb nbd nbm nbn nbo nbr nbu nda ndb ndd ndm ndn ndo ndr ndu nma nmb nmd nmm nmn nmo nmr nmu nna nnb nnm nnn nno nnu no- noa nob nod nom non noo nor nou nra nrb nrd nrm nrn nro nrr nru nua nub nud num nun nuo nur nuu oaa oab oad oam oan oao oar oau ob- oba obb obd obm obn obo obr obu oda odb odd odm odn odo odr odu om- oma omb omd omm omn omo omr omu on- ona onb ond onn ono onr onu oo- ooa oob ood oom oon ooo oor or- ora orb ord orm orn oro orr oru ou- oua oud oum oun ouo our ra- raa rab rad ram ran rao rar rau rba rbb rbd rbm rbn rbo rbr rbu rda rdb rdd rdm rdn rdo rdr rdu rma rmb rmd rmm rmn rmo rmr rna rnb rnd rnm rnn rno rnr rnu roa rob rod rom ron roo ror rou rra rrb rrd rrm rrn rrr rru rua rub rud rum run ruo rur ruu ua- uaa uab uad uam uan uao uar uau uba ubb ubn ubo ubr ubu uda udb udd udm udn udo udr udu um- uma umb umd umm umn umo umr umu un- una unb und unm unn uno unr unu uoa uob uod uom uon uoo uor ur- ura urb urd urm urn uro urr uru uua uum uun uur uuu