a-a a-b a-c aaa aab aac aaf aah aan aao aas aau ab- aba abb abc abf abh abn abo abs abu ac- aca acb acc acf ach acn aco acs acu af- afa afb afc aff afh afn afo afs afu aha ahb ahc ahf ahh ahn aho ahs ahu an- ana anb anc anf anh ann ano ans anu aoa aob aoc aof aoh aon aoo aos aou as- asa asb asc asf ash asn aso ass asu au- aua aub auc auf auh aun auo aus b-u baa bab bac baf bah ban bao bas bau bba bbb bbc bbf bbh bbn bbo bbs bbu bca bcb bcc bcf bch bcn bco bcs bcu bfa bfb bfc bff bfh bfn bfo bfs bfu bha bhb bhc bhf bhh bho bhs bhu bna bnb bnc bnf bnn bno bns bnu boa bob boc bof boh bon boo bos bou bsa bsb bsc bsf bsh bsn bso bss bsu bua bub buc buf buh bun buo bus buu c-- caa cab cac caf cah can cao cas cau cba cbb cbc cbf cbh cbn cbo cbs cbu cca ccb ccc ccf cch ccn cco ccs ccu cfa cfb cfc cff cfh cfn cfo cfs cfu ch- cha chb chc chf chh chn cho chs chu cn- cna cnb cnc cnf cnh cnn cno cns cnu co- coa cob coc cof coh con coo cos cou csa csb csc csf csh csn cso css csu cua cub cuc cuf cuh cun cuo cus cuu faa fab fac faf fah fan fao fas fau fba fbb fbc fbf fbh fbn fbo fbs fbu fca fcb fcc fcf fcn fco fcs fcu ffa ffc fff ffh ffn ffo ffs ffu fha fhb fhc fhf fhh fhn fho fhs fna fnb fnc fnf fnh fnn fns fnu foa fob foc fof foh fon foo fos fou fsa fsb fsc fsf fsh fsn fso fss fsu fua fub fuf fun fuo fus fuu haa hab hac haf hah han hao has hau hba hbb hbc hbf hbh hbn hbo hbs hbu hca hcb hcc hcf hch hcn hco hcs hfa hfb hfc hff hfh hfn hfo hfs hfu hha hhb hhc hhf hhh hhn hho hhs hhu hna hnb hnc hnf hnh hnn hno hns hnu hoa hob hoc hof hoh hon hoo hos hou hsa hsb hsc hsf hsh hsn hss hsu hua hub huc huf huh hun huo hus huu naa nab nac naf nah nan nao nas nau nba nbb nbc nbf nbn nbo nbs nbu nca ncb ncc ncf nch ncn nco ncs ncu nfa nfb nfc nff nfn nfo nfs nfu nha nhb nhc nhf nhh nhn nhs nhu nna nnb nnc nnf nnh nnn nno nns nnu no- noa nob noc nof noh non noo nos nou nsa nsb nsc nsf nsh nsn nso nss nsu nua nub nuc nuh nun nuo nus nuu oaa oab oac oaf oah oan oao oas oau ob- oba obb obc obf obh obn obo obs obu oc- oca ocb occ ocf och ocn oco ocs ocu of- ofa ofb ofc off ofn ofo ofs ofu oha ohc ohf ohh ohn oho ohs ohu on- ona onb onc onf onh onn ono ons onu oo- ooa oob ooc oof ooh oon ooo oos os- osa osb osc osf osh osn oso oss osu ou- oua ouc ouf ouh oun ouo ous saa sab sac saf sah san sao sas sau sba sbb sbc sbf sbh sbn sbo sbs sbu sca scb scc scf sch scn sco scs scu sfa sfb sfc sff sfh sfn sfo sfs sfu sh- sha shb shc shf shh shn sho shs shu sna snb snc snf snn sno sns snu soa sob soc sof soh son soo sos sou ss- ssa ssb ssc ssf ssh ssn sso sss ssu sua sub suc suf suh sun suo sus suu ua- uaa uab uac uaf uah uan uao uas uau uba ubb ubc ubf ubh ubn ubo ubs ubu uca ucb ucc ucf uch ucn uco ucs ucu ufa ufc uff ufh ufn ufo ufs ufu uha uhb uhc uhf uhh uho uhs uhu un- una unb unc unf unh unn uno uns unu uoa uob uoc uon uoo uos usa usb usc usf ush usn uso uss usu uua uuc uun uus uuu