a-a a-b a-t aaa aab aae aak aam aan aat ab- aba abb abe abk abm abn abt aea aeb aee aek aem aen aet aka akb ake akk akm akn ama amb ame amk amm amn amt an- ana anb ane ank anm ann ant at- ata atb ate atm atn att baa bab bae bak bam ban bat bba bbb bbe bbk bbm bbn bbt be- bea beb bee bek bem ben bet bka bkb bke bkk bkm bkn bkt bma bmb bme bmk bmm bmn bmt bna bnb bne bnk bnn bnt bta btb bte btk btm btn btt eaa eab eae eak eam ean eat eba ebb ebe ebk ebm ebn ebt eea eeb eee eek eem een eet eka ekb eke ekt em- ema emb eme emk emm emn emt en- ena enb ene enk enm enn ent eta etb ete etk etm etn ett k-t ka- kaa kab kae kak kam kan kat kba kbb kbe kbk kbm kbn ke- kea keb kee kek kem ken ket kkb kke kkk kkm kkn kkt kma kmb kme kmk kmm kmt kn- kna kne knk knm knn knt kta ktb kte ktk ktm ktn ktt maa mab mae mak mam man mat mba mbb mbe mbk mbm mbt mea meb mee mek mem men met mka mkb mke mkk mkm mkn mkt mma mmb mme mmk mmm mmn mmt mna mnb mne mnk mnm mnn mnt mta mtb mte mtk mtm mtn mtt naa nab nae nak nam nan nat nba nbb nbe nbk nbm nbn nbt ne- nea neb nee nek nem nen net nka nke nkk nkm nkn nkt nma nmb nme nmk nmm nmn nmt nna nnb nne nnk nnm nnn nnt nta ntb nte ntk ntm ntn ntt taa tab tae tak tam tan tat tba tbb tbe tbk tbm tbn tbt te- tea teb tee tek tem ten tet tka tkb tke tkk tkm tkt tma tmb tme tmk tmm tmn tmt tna tnb tne tnk tnm tnn tnt tta ttb tte ttk ttm ttn ttt