-er a-a a-b a-t aaa aab aae aak aam aan aao aar aat ab- aba abb abe abk abm abn abo abr abt aea aeb aee aek aem aen aeo aer aet aka akb ake akk akm akn ako akr ama amb ame amk amm amn amo amr amt an- ana anb ane ank anm ann ano anr ant aoa aob aoe aok aom aon aoo aor aot ar- ara arb are ark arm arn aro arr art at- ata atb ate atm atn ato atr att baa bab bae bak bam ban bao bar bat bba bbb bbe bbk bbm bbn bbo bbr bbt be- bea beb bee bek bem ben beo ber bet bka bkb bke bkk bkm bkn bko bkr bkt bma bmb bme bmk bmm bmn bmo bmr bmt bna bnb bne bnk bnn bno bnr bnt boa bob boe bok bom bon boo bor bot bra brb bre brk brm brn bro brr brt bta btb bte btk btm btn bto btr btt eaa eab eae eak eam ean eao ear eat eba ebb ebe ebk ebm ebn ebo ebr ebt eea eeb eee eek eem een eeo eer eet eka ekb eke eko ekr ekt em- ema emb eme emk emm emn emo emr emt en- ena enb ene enk enm enn eno enr ent eo- eoa eob eoe eok eom eon eoo eor eot era erb ere erk erm ern ero err ert eta etb ete etk etm etn eto etr ett k-t ka- kaa kab kae kak kam kan kao kar kat kba kbb kbe kbk kbm kbn kbo kbr ke- kea keb kee kek kem ken keo ker ket kkb kke kkk kkm kkn kkr kkt kma kmb kme kmk kmm kmo kmt kn- kna kne knk knm knn kno knr knt koa kob koe kok kom kon koo kor kot kra krk krn kro krr krt kta ktb kte ktk ktm ktn kto ktr ktt m-o m-r maa mab mae mak mam man mao mar mat mba mbb mbe mbk mbm mbo mbr mbt mea meb mee mek mem men meo mer met mka mkb mke mkk mkm mkn mko mkr mkt mma mmb mme mmk mmm mmn mmo mmr mmt mna mnb mne mnk mnm mnn mno mnr mnt moa mob moe mok mom mon moo mor mot mra mrb mre mrk mrm mrn mro mrr mrt mta mtb mte mtk mtm mtn mto mtr mtt naa nab nae nak nam nan nao nar nat nba nbb nbe nbk nbm nbn nbo nbr nbt ne- nea neb nee nek nem nen neo ner net nka nke nkk nkm nkn nko nkr nkt nma nmb nme nmk nmm nmn nmo nmr nmt nna nnb nne nnk nnm nnn nno nnt no- noa nob noe nok nom non noo nor not nra nrb nre nrk nrm nrn nro nrr nrt nta ntb nte ntk ntm ntn nto ntr ntt oaa oab oae oak oam oan oao oar oat ob- oba obb obe obk obm obn obo obr obt oea oeb oee oem oen oeo oer oet oka okb oke okk oko okr om- oma omb ome omm omn omo omr omt on- ona onb one onk onn ono onr ont oo- ooa oob ook oom oon ooo oor oot or- ora orb ore ork orm orn oro orr ort ot- ota otb ote otk otm otn oto otr ott ra- raa rab rae rak ram ran rao rar rat rba rbb rbe rbk rbm rbn rbo rbr rbt re- rea reb ree rek rem ren reo rer ret rkb rke rkk rkm rko rkt rma rmb rme rmm rmn rmo rmr rmt rna rnb rnm rnn rno rnr rnt roa rob roe rok rom ron roo ror rot rra rrb rrk rrm rrn rrr rrt rta rtb rte rtk rtm rtn rto rtr rtt taa tab tae tak tam tan tao tar tat tba tbb tbe tbk tbm tbn tbo tbr tbt te- tea teb tee tek tem ten teo ter tet tka tkb tke tkk tkm tko tkr tkt tma tmb tme tmk tmm tmn tmo tmr tmt tna tnb tne tnk tnm tnn tno tnr tnt to- toa tob toe tok tom ton too tor tot tra trb tre trk trm trn tro trr trt tta ttb tte ttk ttm ttn tto ttr ttt