-er a-a a-b a-t aaa aab aae aak aam aan aar aat ab- aba abb abe abk abm abn abr abt aea aeb aee aek aem aen aer aet aka akb ake akk akm akn akr ama amb ame amk amm amn amr amt an- ana anb ane ank anm ann anr ant ar- ara arb are ark arm arn arr art at- ata atb ate atm atn atr att baa bab bae bak bam ban bar bat bba bbb bbe bbk bbm bbn bbr bbt be- bea beb bee bek bem ben ber bet bka bkb bke bkk bkm bkn bkr bkt bma bmb bme bmk bmm bmn bmr bmt bna bnb bne bnk bnn bnr bnt bra brb bre brk brm brn brr brt bta btb bte btk btm btn btr btt eaa eab eae eak eam ean ear eat eba ebb ebe ebk ebm ebn ebr ebt eea eeb eee eek eem een eer eet eka ekb eke ekr ekt em- ema emb eme emk emm emn emr emt en- ena enb ene enk enm enn enr ent era erb ere erk erm ern err ert eta etb ete etk etm etn etr ett k-t ka- kaa kab kae kak kam kan kar kat kba kbb kbe kbk kbm kbn kbr ke- kea keb kee kek kem ken ker ket kkb kke kkk kkm kkn kkr kkt kma kmb kme kmk kmm kmt kn- kna kne knk knm knn knr knt kra krk krn krr krt kta ktb kte ktk ktm ktn ktr ktt m-r maa mab mae mak mam man mar mat mba mbb mbe mbk mbm mbr mbt mea meb mee mek mem men mer met mka mkb mke mkk mkm mkn mkr mkt mma mmb mme mmk mmm mmn mmr mmt mna mnb mne mnk mnm mnn mnr mnt mra mrb mre mrk mrm mrn mrr mrt mta mtb mte mtk mtm mtn mtr mtt naa nab nae nak nam nan nar nat nba nbb nbe nbk nbm nbn nbr nbt ne- nea neb nee nek nem nen ner net nka nke nkk nkm nkn nkr nkt nma nmb nme nmk nmm nmn nmr nmt nna nnb nne nnk nnm nnn nnt nra nrb nre nrk nrm nrn nrr nrt nta ntb nte ntk ntm ntn ntr ntt ra- raa rab rae rak ram ran rar rat rba rbb rbe rbk rbm rbn rbr rbt re- rea reb ree rek rem ren rer ret rkb rke rkk rkm rkt rma rmb rme rmm rmn rmr rmt rna rnb rnm rnn rnr rnt rra rrb rrk rrm rrn rrr rrt rta rtb rte rtk rtm rtn rtr rtt taa tab tae tak tam tan tar tat tba tbb tbe tbk tbm tbn tbr tbt te- tea teb tee tek tem ten ter tet tka tkb tke tkk tkm tkr tkt tma tmb tme tmk tmm tmn tmr tmt tna tnb tne tnk tnm tnn tnr tnt tra trb tre trk trm trn trr trt tta ttb tte ttk ttm ttn ttr ttt