a-a a-b a-c a-t aaa aab aac aak aan aao aas aat aau ab- aba abb abc abk abn abo abs abt abu ac- aca acb acc ack acn aco acs act acu aka akb akc akk akn ako aks aku an- ana anb anc ank ann ano ans ant anu aoa aob aoc aok aon aoo aos aot aou as- asa asb asc ask asn aso ass ast asu at- ata atb atc atn ato ats att atu au- aua aub auc auk aun auo aus aut b-u baa bab bac bak ban bao bas bat bau bba bbb bbc bbk bbn bbo bbs bbt bbu bca bcb bcc bck bcn bco bcs bct bcu bka bkb bkc bkk bkn bko bks bkt bna bnb bnc bnk bnn bno bns bnt bnu boa bob boc bok bon boo bos bot bou bsa bsb bsc bsk bsn bso bss bst bsu bta btb btc btk btn bto bts btt btu bua bub buc buk bun buo bus but buu c-- caa cab cac cak can cao cas cat cau cba cbb cbc cbk cbn cbo cbs cbt cbu cca ccb ccc cck ccn cco ccs cct ccu cka ckb ckc cko cks ckt cn- cna cnb cnc cnn cno cns cnt cnu co- coa cob coc cok con coo cos cot cou csa csb csc csk csn cso css cst csu cta ctb ctc ctk ctn cto cts ctt ctu cua cub cuc cuk cun cuo cus cut cuu k-t ka- kaa kab kac kak kan kao kas kat kau kba kbb kbc kbk kbn kbo kbs kbu kca kcb kcc kck kcn kcs kct kcu kkb kkc kkk kkn kks kkt kku kn- kna knc knk knn kno knt knu koa kob koc kok kon koo kos kot kou ksa ksb ksc ksk ksn kso kss kst ksu kta ktb ktc ktk ktn kto kts ktt ktu kub kuc kuk kun kus kut kuu naa nab nac nak nan nao nas nat nau nba nbb nbc nbk nbn nbo nbs nbt nbu nca ncb ncc nck ncn nco ncs nct ncu nka nkc nkk nkn nko nks nkt nku nna nnb nnc nnk nnn nno nns nnt nnu no- noa nob noc nok non noo nos not nou nsa nsb nsc nsk nsn nso nss nst nsu nta ntb ntc ntk ntn nto nts ntt ntu nua nub nuc nuk nun nuo nus nut nuu oaa oab oac oak oan oao oas oat oau ob- oba obb obc obk obn obo obs obt obu oc- oca ocb occ ock ocn oco ocs oct ocu oka okb okc okk oko oks oku on- ona onb onc onk onn ono ons ont onu oo- ooa oob ooc ook oon ooo oos oot os- osa osb osc osk osn oso oss ost osu ot- ota otb otc otk otn oto ots ott otu ou- oua ouc ouk oun ouo ous out saa sab sac sak san sao sas sat sau sba sbb sbc sbk sbn sbo sbs sbt sbu sca scb scc sck scn sco scs sct scu sk- ska skb skc skk sko sks skt sku sna snb snc snk snn sno sns snt snu soa sob soc sok son soo sos sot sou ss- ssa ssb ssc ssk ssn sso sss sst ssu sta stb stc stk stn sto sts stt stu sua sub suc suk sun suo sus sut suu taa tab tac tak tan tao tas tat tau tba tbb tbc tbk tbn tbo tbs tbt tbu tca tcb tcc tck tcn tco tcs tct tcu tka tkb tkc tkk tko tks tkt tna tnb tnc tnk tnn tno tns tnt to- toa tob toc tok ton too tos tot tou tsa tsb tsc tsk tsn tso tss tst tsu tta ttb ttc ttk ttn tto tts ttt ttu tua tub tuc tuk tun tuo tus tut tuu ua- uaa uab uac uak uan uao uas uat uau uba ubb ubc ubk ubn ubo ubs ubt ubu uca ucb ucc uck ucn uco ucs uct ucu uka ukb ukc ukk ukn uku un- una unb unc unk unn uno uns unt unu uoa uob uoc uok uon uoo uos uot usa usb usc usk usn uso uss ust usu uta utb utc utk utn uto uts utt utu uua uuc uun uus uut uuu