-th a-a a-b a-c a-t aaa aab aac aae aah aas aat aau ab- aba abb abc abe abh abs abt abu ac- aca acb acc ace ach acs act acu aea aeb aec aee aeh aes aet aeu aha ahb ahc ahe ahh ahs aht ahu as- asa asb asc ase ash ass ast asu at- ata atb atc ate ath ats att atu au- aua aub auc aue auh aus aut b-u baa bab bac bae bah bas bat bau bba bbb bbc bbe bbh bbs bbt bbu bca bcb bcc bce bch bcs bct bcu be- bea beb bec bee beh bes bet beu bha bhb bhc bhe bhh bhs bht bhu bsa bsb bsc bse bsh bss bst bsu bta btb btc bte bth bts btt btu bua bub buc bue buh bus but buu c-- caa cab cac cae cah cas cat cau cba cbb cbc cbe cbh cbs cbt cbu cca ccb ccc cce cch ccs cct ccu ce- cea ceb cec cee ceh ces cet ceu ch- cha chb chc che chh chs cht chu csa csb csc cse csh css cst csu cta ctb ctc cte cth cts ctt ctu cua cub cuc cue cuh cus cut cuu eaa eab eac eae eah eas eat eau eba ebb ebc ebe ebh ebs ebt ebu ec- eca ecb ecc ece ech ecs ect ecu eea eeb eec eee ees eet eha ehb ehc ehe ehh ehs eht ehu es- esa esb esc ese esh ess est esu eta etb etc ete eth ets ett etu eu- eua eub euc eue eus eut haa hab hac hae hah has hat hau hba hbb hbc hbe hbh hbs hbt hbu hca hcb hcc hce hch hcs hct he- hea heb hec hee heh hes het heu hha hhb hhc hhe hhh hhs hht hhu hsa hsb hsc hse hsh hss hst hsu hta htb htc hte hth hts htt hua hub huc hue huh hus hut huu saa sab sac sae sah sas sat sau sba sbb sbc sbe sbh sbs sbt sbu sca scb scc sce sch scs sct scu se- sea seb sec see seh ses set seu sh- sha shb shc she shh shs sht shu ss- ssa ssb ssc sse ssh sss sst ssu sta stb stc ste sth sts stt stu sua sub suc sue suh sus sut suu taa tab tac tae tah tas tat tau tba tbb tbc tbe tbh tbs tbt tbu tca tcb tcc tce tch tcs tct tcu te- tea teb tec tee teh tes tet teu th- tha thb thc the thh ths tht thu tsa tsb tsc tse tsh tss tst tsu tta ttb ttc tte tth tts ttt ttu tua tub tuc tue tuh tus tut tuu ua- uaa uab uac uae uah uas uat uau uba ubb ubc ube ubh ubs ubt ubu uca ucb ucc uce uch ucs uct ucu uea ueb uec uee ueh ues uet uha uhb uhc uhe uhh uhs uht uhu usa usb usc use ush uss ust usu uta utb utc ute uth uts utt utu uua uuc uue uus uut uuu