-th a-a a-b a-c a-t aaa aab aac aae aah aan aas aat ab- aba abb abc abe abh abn abs abt ac- aca acb acc ace ach acn acs act aea aeb aec aee aeh aen aes aet aha ahb ahc ahe ahh ahn ahs aht an- ana anb anc ane anh ann ans ant as- asa asb asc ase ash asn ass ast at- ata atb atc ate ath atn ats att baa bab bac bae bah ban bas bat bba bbb bbc bbe bbh bbn bbs bbt bca bcb bcc bce bch bcn bcs bct be- bea beb bec bee beh ben bes bet bha bhb bhc bhe bhh bhs bht bna bnb bnc bne bnn bns bnt bsa bsb bsc bse bsh bsn bss bst bta btb btc bte bth btn bts btt c-- caa cab cac cae cah can cas cat cba cbb cbc cbe cbh cbn cbs cbt cca ccb ccc cce cch ccn ccs cct ce- cea ceb cec cee ceh cen ces cet ch- cha chb chc che chh chn chs cht cn- cna cnb cnc cne cnh cnn cns cnt csa csb csc cse csh csn css cst cta ctb ctc cte cth ctn cts ctt eaa eab eac eae eah ean eas eat eba ebb ebc ebe ebh ebn ebs ebt ec- eca ecb ecc ece ech ecn ecs ect eea eeb eec eee een ees eet eha ehb ehc ehe ehh ehn ehs eht en- ena enb enc ene enh enn ens ent es- esa esb esc ese esh esn ess est eta etb etc ete eth etn ets ett haa hab hac hae hah han has hat hba hbb hbc hbe hbh hbn hbs hbt hca hcb hcc hce hch hcn hcs hct he- hea heb hec hee heh hen hes het hha hhb hhc hhe hhh hhn hhs hht hna hnb hnc hne hnh hnn hns hnt hsa hsb hsc hse hsh hsn hss hst hta htb htc hte hth htn hts htt naa nab nac nae nah nan nas nat nba nbb nbc nbe nbn nbs nbt nca ncb ncc nce nch ncn ncs nct ne- nea neb nec nee neh nen nes net nha nhb nhc nhe nhh nhn nhs nht nna nnb nnc nne nnh nnn nns nnt nsa nsb nsc nse nsh nsn nss nst nta ntb ntc nte nth ntn nts ntt saa sab sac sae sah san sas sat sba sbb sbc sbe sbh sbn sbs sbt sca scb scc sce sch scn scs sct se- sea seb sec see seh sen ses set sh- sha shb shc she shh shn shs sht sna snb snc sne snn sns snt ss- ssa ssb ssc sse ssh ssn sss sst sta stb stc ste sth stn sts stt taa tab tac tae tah tan tas tat tba tbb tbc tbe tbh tbn tbs tbt tca tcb tcc tce tch tcn tcs tct te- tea teb tec tee teh ten tes tet th- tha thb thc the thh thn ths tht tna tnb tnc tne tnh tnn tns tnt tsa tsb tsc tse tsh tsn tss tst tta ttb ttc tte tth ttn tts ttt