-th a-a a-b a-c a-t aaa aab aac aae aah aao aas aat ab- aba abb abc abe abh abo abs abt ac- aca acb acc ace ach aco acs act aea aeb aec aee aeh aeo aes aet aha ahb ahc ahe ahh aho ahs aht aoa aob aoc aoe aoh aoo aos aot as- asa asb asc ase ash aso ass ast at- ata atb atc ate ath ato ats att baa bab bac bae bah bao bas bat bba bbb bbc bbe bbh bbo bbs bbt bca bcb bcc bce bch bco bcs bct be- bea beb bec bee beh beo bes bet bha bhb bhc bhe bhh bho bhs bht boa bob boc boe boh boo bos bot bsa bsb bsc bse bsh bso bss bst bta btb btc bte bth bto bts btt c-- caa cab cac cae cah cao cas cat cba cbb cbc cbe cbh cbo cbs cbt cca ccb ccc cce cch cco ccs cct ce- cea ceb cec cee ceh ceo ces cet ch- cha chb chc che chh cho chs cht co- coa cob coc coe coh coo cos cot csa csb csc cse csh cso css cst cta ctb ctc cte cth cto cts ctt eaa eab eac eae eah eao eas eat eba ebb ebc ebe ebh ebo ebs ebt ec- eca ecb ecc ece ech eco ecs ect eea eeb eec eee eeo ees eet eha ehb ehc ehe ehh eho ehs eht eo- eoa eob eoc eoe eoh eoo eos eot es- esa esb esc ese esh eso ess est eta etb etc ete eth eto ets ett haa hab hac hae hah hao has hat hba hbb hbc hbe hbh hbo hbs hbt hca hcb hcc hce hch hco hcs hct he- hea heb hec hee heh heo hes het hha hhb hhc hhe hhh hho hhs hht hoa hob hoc hoe hoh hoo hos hot hsa hsb hsc hse hsh hss hst hta htb htc hte hth hto hts htt oaa oab oac oae oah oao oas oat ob- oba obb obc obe obh obo obs obt oc- oca ocb occ och oco ocs oct oea oeb oec oee oeh oeo oes oet oha ohc ohe ohh oho ohs oht oo- ooa oob ooc ooh ooo oos oot os- osa osb osc ose osh oso oss ost ot- ota otb otc ote oth oto ots ott saa sab sac sae sah sao sas sat sba sbb sbc sbe sbh sbo sbs sbt sca scb scc sce sch sco scs sct se- sea seb sec see seh seo ses set sh- sha shb shc she shh sho shs sht soa sob soc soe soh soo sos sot ss- ssa ssb ssc sse ssh sso sss sst sta stb stc ste sth sto sts stt taa tab tac tae tah tao tas tat tba tbb tbc tbe tbh tbo tbs tbt tca tcb tcc tce tch tco tcs tct te- tea teb tec tee teh teo tes tet th- tha thb thc the thh tho ths tht to- toa tob toc toe toh too tos tot tsa tsb tsc tse tsh tso tss tst tta ttb ttc tte tth tto tts ttt