a-a a-b a-t aaa aab aae aak aam aan aas aat ab- aba abb abe abk abm abn abs abt aea aeb aee aek aem aen aes aet aka akb ake akk akm akn aks ama amb ame amk amm amn ams amt an- ana anb ane ank anm ann ans ant as- asa asb ase ask asm asn ass ast at- ata atb ate atm atn ats att baa bab bae bak bam ban bas bat bba bbb bbe bbk bbm bbn bbs bbt be- bea beb bee bek bem ben bes bet bka bkb bke bkk bkm bkn bks bkt bma bmb bme bmk bmm bmn bms bmt bna bnb bne bnk bnn bns bnt bsa bsb bse bsk bsm bsn bss bst bta btb bte btk btm btn bts btt eaa eab eae eak eam ean eas eat eba ebb ebe ebk ebm ebn ebs ebt eea eeb eee eek eem een ees eet eka ekb eke eks ekt em- ema emb eme emk emm emn ems emt en- ena enb ene enk enm enn ens ent es- esa esb ese esk esm esn ess est eta etb ete etk etm etn ets ett k-t ka- kaa kab kae kak kam kan kas kat kba kbb kbe kbk kbm kbn kbs ke- kea keb kee kek kem ken kes ket kkb kke kkk kkm kkn kks kkt kma kmb kme kmk kmm kms kmt kn- kna kne knk knm knn knt ksa ksb kse ksk ksm ksn kss kst kta ktb kte ktk ktm ktn kts ktt maa mab mae mak mam man mas mat mba mbb mbe mbk mbm mbs mbt mea meb mee mek mem men mes met mka mkb mke mkk mkm mkn mks mkt mma mmb mme mmk mmm mmn mms mmt mna mnb mne mnk mnm mnn mns mnt msa msb mse msk msm msn mss mst mta mtb mte mtk mtm mtn mts mtt naa nab nae nak nam nan nas nat nba nbb nbe nbk nbm nbn nbs nbt ne- nea neb nee nek nem nen nes net nka nke nkk nkm nkn nks nkt nma nmb nme nmk nmm nmn nms nmt nna nnb nne nnk nnm nnn nns nnt nsa nsb nse nsk nsm nsn nss nst nta ntb nte ntk ntm ntn nts ntt saa sab sae sak sam san sas sat sba sbb sbe sbk sbm sbn sbs sbt se- sea seb see sek sem sen ses set sk- ska skb ske skk skm sks skt sma smb sme smk smm smn sms smt sna snb sne snk snm snn sns snt ss- ssa ssb sse ssk ssm ssn sss sst sta stb ste stk stm stn sts stt taa tab tae tak tam tan tas tat tba tbb tbe tbk tbm tbn tbs tbt te- tea teb tee tek tem ten tes tet tka tkb tke tkk tkm tks tkt tma tmb tme tmk tmm tmn tms tmt tna tnb tne tnk tnm tnn tns tnt tsa tsb tse tsk tsm tsn tss tst tta ttb tte ttk ttm ttn tts ttt