-er a-a a-b aaa aab aae aak aam aan aar aau ab- aba abb abe abk abm abn abr abu aea aeb aee aek aem aen aer aeu aka akb ake akk akm akn akr aku ama amb ame amk amm amn amr amu an- ana anb ane ank anm ann anr anu ar- ara arb are ark arm arn arr aru au- aua aub aue auk aum aun aur b-u baa bab bae bak bam ban bar bau bba bbb bbe bbk bbm bbn bbr bbu be- bea beb bee bek bem ben ber beu bka bkb bke bkk bkm bkn bkr bma bmb bme bmk bmm bmn bmr bmu bna bnb bne bnk bnn bnr bnu bra brb bre brk brm brn brr bru bua bub bue buk bum bun bur buu eaa eab eae eak eam ean ear eau eba ebb ebe ebk ebm ebn ebr ebu eea eeb eee eek eem een eer eka ekb eke ekr eku em- ema emb eme emk emm emn emr emu en- ena enb ene enk enm enn enr enu era erb ere erk erm ern err eru eu- eua eub eue eun eur ka- kaa kab kae kak kam kan kar kau kba kbb kbe kbk kbm kbn kbr kbu ke- kea keb kee kek kem ken ker kkb kke kkk kkm kkn kkr kku kma kmb kme kmk kmm kmu kn- kna kne knk knm knn knr knu kra krk krn krr kru kub kue kuk kum kun kur kuu m-r maa mab mae mak mam man mar mau mba mbb mbe mbk mbm mbr mbu mea meb mee mek mem men mer meu mka mkb mke mkk mkm mkn mkr mku mma mmb mme mmk mmm mmn mmr mmu mna mnb mne mnk mnm mnn mnr mnu mra mrb mre mrk mrm mrn mrr mru mua mub mue muk mum mun mur muu naa nab nae nak nam nan nar nau nba nbb nbe nbk nbm nbn nbr nbu ne- nea neb nee nek nem nen ner neu nka nke nkk nkm nkn nkr nku nma nmb nme nmk nmm nmn nmr nmu nna nnb nne nnk nnm nnn nnu nra nrb nre nrk nrm nrn nrr nru nua nub nue nuk num nun nur nuu ra- raa rab rae rak ram ran rar rau rba rbb rbe rbk rbm rbn rbr rbu re- rea reb ree rek rem ren rer reu rkb rke rkk rkm rku rma rmb rme rmm rmn rmr rna rnb rnm rnn rnr rnu rra rrb rrk rrm rrn rrr rru rua rub rue ruk rum run rur ruu ua- uaa uab uae uak uam uan uar uau uba ubb ube ubk ubn ubr ubu uea ueb uee uem uen uer uka ukb uke ukk ukn ukr uku um- uma umb ume umm umn umr umu un- una unb une unk unm unn unr unu ur- ura urb ure urk urm urn urr uru uua uue uum uun uur uuu