-th a-a a-b a-c a-t aaa aab aac aae aah aan aao aat ab- aba abb abc abe abh abn abo abt ac- aca acb acc ace ach acn aco act aea aeb aec aee aeh aen aeo aet aha ahb ahc ahe ahh ahn aho aht an- ana anb anc ane anh ann ano ant aoa aob aoc aoe aoh aon aoo aot at- ata atb atc ate ath atn ato att baa bab bac bae bah ban bao bat bba bbb bbc bbe bbh bbn bbo bbt bca bcb bcc bce bch bcn bco bct be- bea beb bec bee beh ben beo bet bha bhb bhc bhe bhh bho bht bna bnb bnc bne bnn bno bnt boa bob boc boe boh bon boo bot bta btb btc bte bth btn bto btt c-- caa cab cac cae cah can cao cat cba cbb cbc cbe cbh cbn cbo cbt cca ccb ccc cce cch ccn cco cct ce- cea ceb cec cee ceh cen ceo cet ch- cha chb chc che chh chn cho cht cn- cna cnb cnc cne cnh cnn cno cnt co- coa cob coc coe coh con coo cot cta ctb ctc cte cth ctn cto ctt eaa eab eac eae eah ean eao eat eba ebb ebc ebe ebh ebn ebo ebt ec- eca ecb ecc ece ech ecn eco ect eea eeb eec eee een eeo eet eha ehb ehc ehe ehh ehn eho eht en- ena enb enc ene enh enn eno ent eo- eoa eob eoc eoe eoh eon eoo eot eta etb etc ete eth etn eto ett haa hab hac hae hah han hao hat hba hbb hbc hbe hbh hbn hbo hbt hca hcb hcc hce hch hcn hco hct he- hea heb hec hee heh hen heo het hha hhb hhc hhe hhh hhn hho hht hna hnb hnc hne hnh hnn hno hnt hoa hob hoc hoe hoh hon hoo hot hta htb htc hte hth htn hto htt naa nab nac nae nah nan nao nat nba nbb nbc nbe nbn nbo nbt nca ncb ncc nce nch ncn nco nct ne- nea neb nec nee neh nen neo net nha nhb nhc nhe nhh nhn nht nna nnb nnc nne nnh nnn nno nnt no- noa nob noc noe noh non noo not nta ntb ntc nte nth ntn nto ntt oaa oab oac oae oah oan oao oat ob- oba obb obc obe obh obn obo obt oc- oca ocb occ och ocn oco oct oea oeb oec oee oeh oen oeo oet oha ohc ohe ohh ohn oho oht on- ona onb onc one onh onn ono ont oo- ooa oob ooc ooh oon ooo oot ot- ota otb otc ote oth otn oto ott taa tab tac tae tah tan tao tat tba tbb tbc tbe tbh tbn tbo tbt tca tcb tcc tce tch tcn tco tct te- tea teb tec tee teh ten teo tet th- tha thb thc the thh thn tho tht tna tnb tnc tne tnh tnn tno tnt to- toa tob toc toe toh ton too tot tta ttb ttc tte tth ttn tto ttt