-er a-a a-b a-i aaa aab aae aag aai aak aam aar ab- aba abb abe abg abi abk abm abr aea aeb aee aeg aei aek aem aer ag- aga agb age agg agi agk agm agr ai- aia aib aie aig aii aik aim air aka akb ake akg aki akk akm akr ama amb ame amg ami amk amm amr ar- ara arb are arg ari ark arm arr baa bab bae bag bai bak bam bar bba bbb bbe bbg bbi bbk bbm bbr be- bea beb bee beg bei bek bem ber bga bgb bge bgg bgi bgk bgm bgr bi- bia bib bie big bii bik bim bir bka bkb bke bkg bkk bkm bkr bma bmb bme bmg bmi bmk bmm bmr bra brb bre brg bri brk brm brr eaa eab eae eag eai eak eam ear eba ebb ebe ebg ebi ebk ebm ebr eea eeb eee eeg eek eem eer ega egb ege egg egi egm egr eia eib eie eig eii eik eim eir eka ekb eke ekg eki ekr em- ema emb eme emg emi emk emm emr era erb ere erg eri erk erm err gaa gab gae gag gai gak gam gar gba gbe gbg gbi gbk gbm gbr ge- gea geb gee geg gei gek gem ger gga ggb ggg ggi ggm ggr gia gib gie gig gii gik gim gir gka gkb gkm gma gmb gme gmg gmi gmm gmr gra grb gre grg gri grk grm grr ia- iaa iab iae iag iai iam iar iba ibb ibe ibg ibi ibk ibm ibr ie- iea iee ieg iei iek iem ier iga igb ige igg igi igk igm igr iia iib iie iii iim iir ika ikb ike iki ikk ikr im- ima imb ime img imi imm ir- ira irb ire irg iri irk irm irr ka- kaa kab kae kag kai kak kam kar kba kbb kbe kbi kbk kbm kbr ke- kea keb kee keg kei kek kem ker kga kgb kgi kgm kia kib kie kig kii kik kim kir kkb kke kki kkk kkm kkr kma kmb kme kmg kmi kmk kmm kra krg kri krk krr m-r maa mab mae mag mai mak mam mar mba mbb mbe mbg mbi mbk mbm mbr mea meb mee meg mei mek mem mer mga mgb mge mgi mgk mgm mgr mi- mia mib mie mig mii mik mim mir mka mkb mke mkg mkk mkm mkr mma mmb mme mmg mmi mmk mmm mmr mra mrb mre mrg mri mrk mrm mrr ra- raa rab rae rag rai rak ram rar rba rbb rbe rbg rbi rbk rbm rbr re- rea reb ree reg rei rek rem rer rga rgb rge rgg rgi rgk rgr ria rib rie rig rii rik rim rir rkb rke rkg rkk rkm rma rmb rme rmg rmi rmm rmr rra rrb rrg rri rrk rrm rrr