a-a a-b a-c a-t aaa aab aac aae aao aas aat aau ab- aba abb abc abe abo abs abt abu ac- aca acb acc ace aco acs act acu aea aeb aec aee aeo aes aet aeu aoa aob aoc aoe aoo aos aot aou as- asa asb asc ase aso ass ast asu at- ata atb atc ate ato ats att atu au- aua aub auc aue auo aus aut b-u baa bab bac bae bao bas bat bau bba bbb bbc bbe bbo bbs bbt bbu bca bcb bcc bce bco bcs bct bcu be- bea beb bec bee beo bes bet beu boa bob boc boe boo bos bot bou bsa bsb bsc bse bso bss bst bsu bta btb btc bte bto bts btt btu bua bub buc bue buo bus but buu c-- caa cab cac cae cao cas cat cau cba cbb cbc cbe cbo cbs cbt cbu cca ccb ccc cce cco ccs cct ccu ce- cea ceb cec cee ceo ces cet ceu co- coa cob coc coe coo cos cot cou csa csb csc cse cso css cst csu cta ctb ctc cte cto cts ctt ctu cua cub cuc cue cuo cus cut cuu eaa eab eac eae eao eas eat eau eba ebb ebc ebe ebo ebs ebt ebu ec- eca ecb ecc ece eco ecs ect ecu eea eeb eec eee eeo ees eet eo- eoa eob eoc eoe eoo eos eot eou es- esa esb esc ese eso ess est esu eta etb etc ete eto ets ett etu eu- eua eub euc eue eus eut oaa oab oac oae oao oas oat oau ob- oba obb obc obe obo obs obt obu oc- oca ocb occ oco ocs oct ocu oea oeb oec oee oeo oes oet oo- ooa oob ooc ooo oos oot os- osa osb osc ose oso oss ost osu ot- ota otb otc ote oto ots ott otu ou- oua ouc oue ouo ous out saa sab sac sae sao sas sat sau sba sbb sbc sbe sbo sbs sbt sbu sca scb scc sce sco scs sct scu se- sea seb sec see seo ses set seu soa sob soc soe soo sos sot sou ss- ssa ssb ssc sse sso sss sst ssu sta stb stc ste sto sts stt stu sua sub suc sue suo sus sut suu taa tab tac tae tao tas tat tau tba tbb tbc tbe tbo tbs tbt tbu tca tcb tcc tce tco tcs tct tcu te- tea teb tec tee teo tes tet teu to- toa tob toc toe too tos tot tou tsa tsb tsc tse tso tss tst tsu tta ttb ttc tte tto tts ttt ttu tua tub tuc tue tuo tus tut tuu ua- uaa uab uac uae uao uas uat uau uba ubb ubc ube ubo ubs ubt ubu uca ucb ucc uce uco ucs uct ucu uea ueb uec uee ues uet uoa uob uoc uoe uoo uos uot usa usb usc use uso uss ust usu uta utb utc ute uto uts utt utu uua uuc uue uus uut uuu