a-a a-b a-c a-t aaa aab aac aae aan aao aas aat aau ab- aba abb abc abe abn abo abs abt abu ac- aca acb acc ace acn aco acs act acu aea aeb aec aee aen aeo aes aet aeu an- ana anb anc ane ann ano ans ant anu aoa aob aoc aoe aon aoo aos aot aou as- asa asb asc ase asn aso ass ast asu at- ata atb atc ate atn ato ats att atu au- aua aub auc aue aun auo aus aut b-u baa bab bac bae ban bao bas bat bau bba bbb bbc bbe bbn bbo bbs bbt bbu bca bcb bcc bce bcn bco bcs bct bcu be- bea beb bec bee ben beo bes bet beu bna bnb bnc bne bnn bno bns bnt bnu boa bob boc boe bon boo bos bot bou bsa bsb bsc bse bsn bso bss bst bsu bta btb btc bte btn bto bts btt btu bua bub buc bue bun buo bus but buu c-- caa cab cac cae can cao cas cat cau cba cbb cbc cbe cbn cbo cbs cbt cbu cca ccb ccc cce ccn cco ccs cct ccu ce- cea ceb cec cee cen ceo ces cet ceu cn- cna cnb cnc cne cnn cno cns cnt cnu co- coa cob coc coe con coo cos cot cou csa csb csc cse csn cso css cst csu cta ctb ctc cte ctn cto cts ctt ctu cua cub cuc cue cun cuo cus cut cuu eaa eab eac eae ean eao eas eat eau eba ebb ebc ebe ebn ebo ebs ebt ebu ec- eca ecb ecc ece ecn eco ecs ect ecu eea eeb eec eee een eeo ees eet en- ena enb enc ene enn eno ens ent enu eo- eoa eob eoc eoe eon eoo eos eot eou es- esa esb esc ese esn eso ess est esu eta etb etc ete etn eto ets ett etu eu- eua eub euc eue eun eus eut naa nab nac nae nan nao nas nat nau nba nbb nbc nbe nbn nbo nbs nbt nbu nca ncb ncc nce ncn nco ncs nct ncu ne- nea neb nec nee nen neo nes net neu nna nnb nnc nne nnn nno nns nnt nnu no- noa nob noc noe non noo nos not nou nsa nsb nsc nse nsn nso nss nst nsu nta ntb ntc nte ntn nto nts ntt ntu nua nub nuc nue nun nuo nus nut nuu oaa oab oac oae oan oao oas oat oau ob- oba obb obc obe obn obo obs obt obu oc- oca ocb occ ocn oco ocs oct ocu oea oeb oec oee oen oeo oes oet on- ona onb onc one onn ono ons ont onu oo- ooa oob ooc oon ooo oos oot os- osa osb osc ose osn oso oss ost osu ot- ota otb otc ote otn oto ots ott otu ou- oua ouc oue oun ouo ous out saa sab sac sae san sao sas sat sau sba sbb sbc sbe sbn sbo sbs sbt sbu sca scb scc sce scn sco scs sct scu se- sea seb sec see sen seo ses set seu sna snb snc sne snn sno sns snt snu soa sob soc soe son soo sos sot sou ss- ssa ssb ssc sse ssn sso sss sst ssu sta stb stc ste stn sto sts stt stu sua sub suc sue sun suo sus sut suu taa tab tac tae tan tao tas tat tau tba tbb tbc tbe tbn tbo tbs tbt tbu tca tcb tcc tce tcn tco tcs tct tcu te- tea teb tec tee ten teo tes tet teu tna tnb tnc tne tnn tno tns tnt to- toa tob toc toe ton too tos tot tou tsa tsb tsc tse tsn tso tss tst tsu tta ttb ttc tte ttn tto tts ttt ttu tua tub tuc tue tun tuo tus tut tuu ua- uaa uab uac uae uan uao uas uat uau uba ubb ubc ube ubn ubo ubs ubt ubu uca ucb ucc uce ucn uco ucs uct ucu uea ueb uec uee uen ues uet un- una unb unc une unn uno uns unt unu uoa uob uoc uoe uon uoo uos uot usa usb usc use usn uso uss ust usu uta utb utc ute utn uto uts utt utu uua uuc uue uun uus uut uuu