-er a-a a-b aaa aab aae aag aak aam aar ab- aba abb abe abg abk abm abr aea aeb aee aeg aek aem aer ag- aga agb age agg agk agm agr aka akb ake akg akk akm akr ama amb ame amg amk amm amr ar- ara arb are arg ark arm arr baa bab bae bag bak bam bar bba bbb bbe bbg bbk bbm bbr be- bea beb bee beg bek bem ber bga bgb bge bgg bgk bgm bgr bka bkb bke bkg bkk bkm bkr bma bmb bme bmg bmk bmm bmr bra brb bre brg brk brm brr eaa eab eae eag eak eam ear eba ebb ebe ebg ebk ebm ebr eea eeb eee eeg eek eem eer ega egb ege egg egm egr eka ekb eke ekg ekr em- ema emb eme emg emk emm emr era erb ere erg erk erm err gaa gab gae gag gak gam gar gba gbe gbg gbk gbm gbr ge- gea geb gee geg gek gem ger gga ggb ggg ggm ggr gka gkb gkm gma gmb gme gmg gmm gmr gra grb gre grg grk grm grr ka- kaa kab kae kag kak kam kar kba kbb kbe kbk kbm kbr ke- kea keb kee keg kek kem ker kga kgb kgm kkb kke kkk kkm kkr kma kmb kme kmg kmk kmm kra krg krk krr m-r maa mab mae mag mak mam mar mba mbb mbe mbg mbk mbm mbr mea meb mee meg mek mem mer mga mgb mge mgk mgm mgr mka mkb mke mkg mkk mkm mkr mma mmb mme mmg mmk mmm mmr mra mrb mre mrg mrk mrm mrr ra- raa rab rae rag rak ram rar rba rbb rbe rbg rbk rbm rbr re- rea reb ree reg rek rem rer rga rgb rge rgg rgk rgr rkb rke rkg rkk rkm rma rmb rme rmg rmm rmr rra rrb rrg rrk rrm rrr