a-a a-b a-c a-t aaa aab aac aae aan aas aat aau ab- aba abb abc abe abn abs abt abu ac- aca acb acc ace acn acs act acu aea aeb aec aee aen aes aet aeu an- ana anb anc ane ann ans ant anu as- asa asb asc ase asn ass ast asu at- ata atb atc ate atn ats att atu au- aua aub auc aue aun aus aut b-u baa bab bac bae ban bas bat bau bba bbb bbc bbe bbn bbs bbt bbu bca bcb bcc bce bcn bcs bct bcu be- bea beb bec bee ben bes bet beu bna bnb bnc bne bnn bns bnt bnu bsa bsb bsc bse bsn bss bst bsu bta btb btc bte btn bts btt btu bua bub buc bue bun bus but buu c-- caa cab cac cae can cas cat cau cba cbb cbc cbe cbn cbs cbt cbu cca ccb ccc cce ccn ccs cct ccu ce- cea ceb cec cee cen ces cet ceu cn- cna cnb cnc cne cnn cns cnt cnu csa csb csc cse csn css cst csu cta ctb ctc cte ctn cts ctt ctu cua cub cuc cue cun cus cut cuu eaa eab eac eae ean eas eat eau eba ebb ebc ebe ebn ebs ebt ebu ec- eca ecb ecc ece ecn ecs ect ecu eea eeb eec eee een ees eet en- ena enb enc ene enn ens ent enu es- esa esb esc ese esn ess est esu eta etb etc ete etn ets ett etu eu- eua eub euc eue eun eus eut naa nab nac nae nan nas nat nau nba nbb nbc nbe nbn nbs nbt nbu nca ncb ncc nce ncn ncs nct ncu ne- nea neb nec nee nen nes net neu nna nnb nnc nne nnn nns nnt nnu nsa nsb nsc nse nsn nss nst nsu nta ntb ntc nte ntn nts ntt ntu nua nub nuc nue nun nus nut nuu saa sab sac sae san sas sat sau sba sbb sbc sbe sbn sbs sbt sbu sca scb scc sce scn scs sct scu se- sea seb sec see sen ses set seu sna snb snc sne snn sns snt snu ss- ssa ssb ssc sse ssn sss sst ssu sta stb stc ste stn sts stt stu sua sub suc sue sun sus sut suu taa tab tac tae tan tas tat tau tba tbb tbc tbe tbn tbs tbt tbu tca tcb tcc tce tcn tcs tct tcu te- tea teb tec tee ten tes tet teu tna tnb tnc tne tnn tns tnt tsa tsb tsc tse tsn tss tst tsu tta ttb ttc tte ttn tts ttt ttu tua tub tuc tue tun tus tut tuu ua- uaa uab uac uae uan uas uat uau uba ubb ubc ube ubn ubs ubt ubu uca ucb ucc uce ucn ucs uct ucu uea ueb uec uee uen ues uet un- una unb unc une unn uns unt unu usa usb usc use usn uss ust usu uta utb utc ute utn uts utt utu uua uuc uue uun uus uut uuu