a-a a-b a-c a-t aaa aab aac aan aao aas aat aau ab- aba abb abc abn abo abs abt abu ac- aca acb acc acn aco acs act acu an- ana anb anc ann ano ans ant anu aoa aob aoc aon aoo aos aot aou as- asa asb asc asn aso ass ast asu at- ata atb atc atn ato ats att atu au- aua aub auc aun auo aus aut b-u baa bab bac ban bao bas bat bau bba bbb bbc bbn bbo bbs bbt bbu bca bcb bcc bcn bco bcs bct bcu bna bnb bnc bnn bno bns bnt bnu boa bob boc bon boo bos bot bou bsa bsb bsc bsn bso bss bst bsu bta btb btc btn bto bts btt btu bua bub buc bun buo bus but buu c-- caa cab cac can cao cas cat cau cba cbb cbc cbn cbo cbs cbt cbu cca ccb ccc ccn cco ccs cct ccu cn- cna cnb cnc cnn cno cns cnt cnu co- coa cob coc con coo cos cot cou csa csb csc csn cso css cst csu cta ctb ctc ctn cto cts ctt ctu cua cub cuc cun cuo cus cut cuu naa nab nac nan nao nas nat nau nba nbb nbc nbn nbo nbs nbt nbu nca ncb ncc ncn nco ncs nct ncu nna nnb nnc nnn nno nns nnt nnu no- noa nob noc non noo nos not nou nsa nsb nsc nsn nso nss nst nsu nta ntb ntc ntn nto nts ntt ntu nua nub nuc nun nuo nus nut nuu oaa oab oac oan oao oas oat oau ob- oba obb obc obn obo obs obt obu oc- oca ocb occ ocn oco ocs oct ocu on- ona onb onc onn ono ons ont onu oo- ooa oob ooc oon ooo oos oot os- osa osb osc osn oso oss ost osu ot- ota otb otc otn oto ots ott otu ou- oua ouc oun ouo ous out saa sab sac san sao sas sat sau sba sbb sbc sbn sbo sbs sbt sbu sca scb scc scn sco scs sct scu sna snb snc snn sno sns snt snu soa sob soc son soo sos sot sou ss- ssa ssb ssc ssn sso sss sst ssu sta stb stc stn sto sts stt stu sua sub suc sun suo sus sut suu taa tab tac tan tao tas tat tau tba tbb tbc tbn tbo tbs tbt tbu tca tcb tcc tcn tco tcs tct tcu tna tnb tnc tnn tno tns tnt to- toa tob toc ton too tos tot tou tsa tsb tsc tsn tso tss tst tsu tta ttb ttc ttn tto tts ttt ttu tua tub tuc tun tuo tus tut tuu ua- uaa uab uac uan uao uas uat uau uba ubb ubc ubn ubo ubs ubt ubu uca ucb ucc ucn uco ucs uct ucu un- una unb unc unn uno uns unt unu uoa uob uoc uon uoo uos uot usa usb usc usn uso uss ust usu uta utb utc utn uto uts utt utu uua uuc uun uus uut uuu