-th a-a a-b a-c a-t aaa aab aac aae aah aak aan aat ab- aba abb abc abe abh abk abn abt ac- aca acb acc ace ach ack acn act aea aeb aec aee aeh aek aen aet aha ahb ahc ahe ahh ahk ahn aht aka akb akc ake akh akk akn an- ana anb anc ane anh ank ann ant at- ata atb atc ate ath atn att baa bab bac bae bah bak ban bat bba bbb bbc bbe bbh bbk bbn bbt bca bcb bcc bce bch bck bcn bct be- bea beb bec bee beh bek ben bet bha bhb bhc bhe bhh bhk bht bka bkb bkc bke bkk bkn bkt bna bnb bnc bne bnk bnn bnt bta btb btc bte bth btk btn btt c-- caa cab cac cae cah cak can cat cba cbb cbc cbe cbh cbk cbn cbt cca ccb ccc cce cch cck ccn cct ce- cea ceb cec cee ceh cek cen cet ch- cha chb chc che chh chk chn cht cka ckb ckc ckh ckt cn- cna cnb cnc cne cnh cnn cnt cta ctb ctc cte cth ctk ctn ctt eaa eab eac eae eah eak ean eat eba ebb ebc ebe ebh ebk ebn ebt ec- eca ecb ecc ece ech eck ecn ect eea eeb eec eee eek een eet eha ehb ehc ehe ehh ehn eht eka ekb ekc eke ekh ekt en- ena enb enc ene enh enk enn ent eta etb etc ete eth etk etn ett haa hab hac hae hah hak han hat hba hbb hbc hbe hbh hbk hbn hbt hca hcb hcc hce hch hck hcn hct he- hea heb hec hee heh hek hen het hha hhb hhc hhe hhh hhk hhn hht hka hkb hkh hkk hkn hkt hna hnb hnc hne hnh hnk hnn hnt hta htb htc hte hth htk htn htt k-t ka- kaa kab kac kae kah kak kan kat kba kbb kbc kbe kbh kbk kbn kca kcb kcc kce kch kck kcn kct ke- kea keb kec kee keh kek ken ket kha khe khh khk khn kkb kkc kke kkh kkk kkn kkt kn- kna knc kne knk knn knt kta ktb ktc kte kth ktk ktn ktt naa nab nac nae nah nak nan nat nba nbb nbc nbe nbk nbn nbt nca ncb ncc nce nch nck ncn nct ne- nea neb nec nee neh nek nen net nha nhb nhc nhe nhh nhk nhn nht nka nkc nke nkk nkn nkt nna nnb nnc nne nnh nnk nnn nnt nta ntb ntc nte nth ntk ntn ntt taa tab tac tae tah tak tan tat tba tbb tbc tbe tbh tbk tbn tbt tca tcb tcc tce tch tck tcn tct te- tea teb tec tee teh tek ten tet th- tha thb thc the thh thk thn tht tka tkb tkc tke tkk tkt tna tnb tnc tne tnh tnk tnn tnt tta ttb ttc tte tth ttk ttn ttt