a-a a-b a-c a-t aaa aab aac aae aaf aao aas aat aau ab- aba abb abc abe abf abo abs abt abu ac- aca acb acc ace acf aco acs act acu aea aeb aec aee aef aeo aes aet aeu af- afa afb afc afe aff afo afs aft afu aoa aob aoc aoe aof aoo aos aot aou as- asa asb asc ase asf aso ass ast asu at- ata atb atc ate atf ato ats att atu au- aua aub auc aue auf auo aus aut b-u baa bab bac bae baf bao bas bat bau bba bbb bbc bbe bbf bbo bbs bbt bbu bca bcb bcc bce bcf bco bcs bct bcu be- bea beb bec bee bef beo bes bet beu bfa bfb bfc bfe bff bfo bfs bft bfu boa bob boc boe bof boo bos bot bou bsa bsb bsc bse bsf bso bss bst bsu bta btb btc bte btf bto bts btt btu bua bub buc bue buf buo bus but buu c-- caa cab cac cae caf cao cas cat cau cba cbb cbc cbe cbf cbo cbs cbt cbu cca ccb ccc cce ccf cco ccs cct ccu ce- cea ceb cec cee cef ceo ces cet ceu cfa cfb cfc cfe cff cfo cfs cft cfu co- coa cob coc coe cof coo cos cot cou csa csb csc cse csf cso css cst csu cta ctb ctc cte ctf cto cts ctt ctu cua cub cuc cue cuf cuo cus cut cuu eaa eab eac eae eaf eao eas eat eau eba ebb ebc ebe ebf ebo ebs ebt ebu ec- eca ecb ecc ece ecf eco ecs ect ecu eea eeb eec eee eef eeo ees eet ef- efa efb efc efe eff efo efs eft eo- eoa eob eoc eoe eof eoo eos eot eou es- esa esb esc ese esf eso ess est esu eta etb etc ete etf eto ets ett etu eu- eua eub euc eue euf eus eut faa fab fac fae faf fao fas fat fau fba fbb fbc fbe fbf fbo fbs fbt fbu fca fcb fcc fce fcf fco fcs fct fcu fea feb fec fee fef feo fes fet feu ffa ffc ffe fff ffo ffs fft ffu foa fob foc foe fof foo fos fot fou fsa fsb fsc fse fsf fso fss fst fsu fta ftb ftc fte ftf fto fts ftt ftu fua fub fue fuf fuo fus fut fuu oaa oab oac oae oaf oao oas oat oau ob- oba obb obc obe obf obo obs obt obu oc- oca ocb occ ocf oco ocs oct ocu oea oeb oec oee oef oeo oes oet of- ofa ofb ofc ofe off ofo ofs oft ofu oo- ooa oob ooc oof ooo oos oot os- osa osb osc ose osf oso oss ost osu ot- ota otb otc ote otf oto ots ott otu ou- oua ouc oue ouf ouo ous out saa sab sac sae saf sao sas sat sau sba sbb sbc sbe sbf sbo sbs sbt sbu sca scb scc sce scf sco scs sct scu se- sea seb sec see sef seo ses set seu sfa sfb sfc sfe sff sfo sfs sft sfu soa sob soc soe sof soo sos sot sou ss- ssa ssb ssc sse ssf sso sss sst ssu sta stb stc ste stf sto sts stt stu sua sub suc sue suf suo sus sut suu taa tab tac tae taf tao tas tat tau tba tbb tbc tbe tbf tbo tbs tbt tbu tca tcb tcc tce tcf tco tcs tct tcu te- tea teb tec tee tef teo tes tet teu tfa tfb tfc tfe tff tfo tfs tft tfu to- toa tob toc toe tof too tos tot tou tsa tsb tsc tse tsf tso tss tst tsu tta ttb ttc tte ttf tto tts ttt ttu tua tub tuc tue tuf tuo tus tut tuu ua- uaa uab uac uae uaf uao uas uat uau uba ubb ubc ube ubf ubo ubs ubt ubu uca ucb ucc uce ucf uco ucs uct ucu uea ueb uec uee uef ues uet ufa ufc ufe uff ufo ufs uft ufu uoa uob uoc uoe uoo uos uot usa usb usc use usf uso uss ust usu uta utb utc ute utf uto uts utt utu uua uuc uue uus uut uuu