-er a-a a-b aaa aab aae aaj aak aam aao aar ab- aba abb abe abj abk abm abo abr aea aeb aee aej aek aem aeo aer aja ajb aje ajj ajk ajm ajo ajr aka akb ake akj akk akm ako akr ama amb ame amk amm amo amr aoa aob aoe aoj aok aom aoo aor ar- ara arb are arj ark arm aro arr baa bab bae baj bak bam bao bar bba bbb bbe bbk bbm bbo bbr be- bea beb bee bek bem beo ber bja bjj bjk bjm bjr bka bkb bke bkk bkm bko bkr bma bmb bme bmj bmk bmm bmo bmr boa bob boe boj bok bom boo bor bra brb bre brj brk brm bro brr eaa eab eae eaj eak eam eao ear eba ebb ebe ebj ebk ebm ebo ebr eea eeb eee eek eem eeo eer eja ejo eka ekb eke eko ekr em- ema emb eme emk emm emo emr eo- eoa eob eoe eok eom eoo eor era erb ere erk erm ero err jaa jab jae jaj jak jam jao jar jba jbj jbk jbm jbo jbr jea jeb jee jej jek jem jeo jer jja jjb jjj jjk jjr jka jkb jkk jkm jko jkr jma jmb jme jmj jmm jmo jmr joa job joe joj jok jom joo jor jra jrb jrk jrm jro jrr ka- kaa kab kae kaj kak kam kao kar kba kbb kbe kbk kbm kbo kbr ke- kea keb kee kek kem keo ker kjb kje kjr kkb kke kkk kkm kkr kma kmb kme kmj kmk kmm kmo koa kob koe kok kom koo kor kra krk kro krr m-o m-r maa mab mae maj mak mam mao mar mba mbb mbe mbj mbk mbm mbo mbr mea meb mee mej mek mem meo mer mjb mje mjj mjk mjm mjr mka mkb mke mkk mkm mko mkr mma mmb mme mmj mmk mmm mmo mmr moa mob moe mok mom moo mor mra mrb mre mrj mrk mrm mro mrr oaa oab oae oaj oak oam oao oar ob- oba obb obe obj obk obm obo obr oea oeb oee oem oeo oer oja ojb oje ojm ojo oka okb oke okj okk oko okr om- oma omb ome omj omm omo omr oo- ooa oob ook oom ooo oor or- ora orb ore ork orm oro orr ra- raa rab rae raj rak ram rao rar rba rbb rbe rbk rbm rbo rbr re- rea reb ree rek rem reo rer rja rjk rjm rjr rkb rke rkk rkm rko rma rmb rme rmm rmo rmr roa rob roe roj rok rom roo ror rra rrb rrk rrm rrr