-er a-a a-b aaa aab aae aaf aaj aam aao aar ab- aba abb abe abf abj abm abo abr aea aeb aee aef aej aem aeo aer af- afa afb afe aff afj afm afo afr aja ajb aje ajf ajj ajm ajo ajr ama amb ame amf amm amo amr aoa aob aoe aof aoj aom aoo aor ar- ara arb are arf arj arm aro arr baa bab bae baf baj bam bao bar bba bbb bbe bbf bbm bbo bbr be- bea beb bee bef bem beo ber bfa bfb bfe bff bfj bfm bfo bfr bja bjf bjj bjm bjr bma bmb bme bmf bmj bmm bmo bmr boa bob boe bof boj bom boo bor bra brb bre brf brj brm bro brr eaa eab eae eaf eaj eam eao ear eba ebb ebe ebf ebj ebm ebo ebr eea eeb eee eef eem eeo eer ef- efa efb efe eff efm efo efr eja ejf ejo em- ema emb eme emf emm emo emr eo- eoa eob eoe eof eom eoo eor era erb ere erf erm ero err faa fab fae faf faj fam fao far fba fbb fbe fbf fbm fbo fbr fea feb fee fef fem feo fer ffa ffe fff ffm ffo ffr fja fjb fjm fma fmb fme fmf fmj fmm fmo fmr foa fob foe fof fom foo for fra frb fre frf frj frm fro frr jaa jab jae jaf jaj jam jao jar jba jbf jbj jbm jbo jbr jea jeb jee jef jej jem jeo jer jfa jfb jfe jff jfj jfm jfo jfr jja jjb jjf jjj jjr jma jmb jme jmf jmj jmm jmo jmr joa job joe jof joj jom joo jor jra jrb jrf jrm jro jrr m-f m-o m-r maa mab mae maf maj mam mao mar mba mbb mbe mbf mbj mbm mbo mbr mea meb mee mef mej mem meo mer mfa mfb mfe mff mfj mfm mfo mfr mjb mje mjj mjm mjr mma mmb mme mmf mmj mmm mmo mmr moa mob moe mof mom moo mor mra mrb mre mrf mrj mrm mro mrr oaa oab oae oaf oaj oam oao oar ob- oba obb obe obf obj obm obo obr oea oeb oee oef oem oeo oer of- ofa ofb ofe off ofm ofo ofr oja ojb oje ojm ojo om- oma omb ome omf omj omm omo omr oo- ooa oob oof oom ooo oor or- ora orb ore orf orm oro orr ra- raa rab rae raf raj ram rao rar rba rbb rbe rbf rbm rbo rbr re- rea reb ree ref rem reo rer rfa rfb rfe rff rfj rfm rfo rfr rja rjf rjm rjr rma rmb rme rmf rmm rmo rmr roa rob roe rof roj rom roo ror rra rrb rrf rrm rrr