-er a-a a-b aaa aab aae aag aak aam aar aau ab- aba abb abe abg abk abm abr abu aea aeb aee aeg aek aem aer aeu ag- aga agb age agg agk agm agr agu aka akb ake akg akk akm akr aku ama amb ame amg amk amm amr amu ar- ara arb are arg ark arm arr aru au- aua aub aue aug auk aum aur b-u baa bab bae bag bak bam bar bau bba bbb bbe bbg bbk bbm bbr bbu be- bea beb bee beg bek bem ber beu bga bgb bge bgg bgk bgm bgr bgu bka bkb bke bkg bkk bkm bkr bma bmb bme bmg bmk bmm bmr bmu bra brb bre brg brk brm brr bru bua bub bue bug buk bum bur buu eaa eab eae eag eak eam ear eau eba ebb ebe ebg ebk ebm ebr ebu eea eeb eee eeg eek eem eer ega egb ege egg egm egr egu eka ekb eke ekg ekr eku em- ema emb eme emg emk emm emr emu era erb ere erg erk erm err eru eu- eua eub eue eug eur gaa gab gae gag gak gam gar gau gba gbe gbg gbk gbm gbr gbu ge- gea geb gee geg gek gem ger geu gga ggb ggg ggm ggr ggu gka gkb gkm gma gmb gme gmg gmm gmr gra grb gre grg grk grm grr gru gu- gua gub gue gug guk gum gur guu ka- kaa kab kae kag kak kam kar kau kba kbb kbe kbk kbm kbr kbu ke- kea keb kee keg kek kem ker kga kgb kgm kgu kkb kke kkk kkm kkr kku kma kmb kme kmg kmk kmm kmu kra krg krk krr kru kub kue kug kuk kum kur kuu m-r maa mab mae mag mak mam mar mau mba mbb mbe mbg mbk mbm mbr mbu mea meb mee meg mek mem mer meu mga mgb mge mgk mgm mgr mgu mka mkb mke mkg mkk mkm mkr mku mma mmb mme mmg mmk mmm mmr mmu mra mrb mre mrg mrk mrm mrr mru mua mub mue mug muk mum mur muu ra- raa rab rae rag rak ram rar rau rba rbb rbe rbg rbk rbm rbr rbu re- rea reb ree reg rek rem rer reu rga rgb rge rgg rgk rgr rkb rke rkg rkk rkm rku rma rmb rme rmg rmm rmr rra rrb rrg rrk rrm rrr rru rua rub rue rug ruk rum rur ruu ua- uaa uab uae uag uak uam uar uau uba ubb ube ubg ubk ubr ubu uea ueb uee ueg uem uer uga ugb uge ugg ugk ugm ugr ugu uka ukb uke ukk ukr uku um- uma umb ume umg umm umr umu ur- ura urb ure urg urk urm urr uru uua uue uug uum uur uuu