a-a a-b a-c aaa aab aac aad aah aan aas aau ab- aba abb abc abd abh abn abs abu ac- aca acb acc acd ach acn acs acu ad- ada adb adc add adh adn ads adu aha ahb ahc ahd ahh ahn ahs ahu an- ana anb anc and anh ann ans anu as- asa asb asc asd ash asn ass asu au- aua aub auc aud auh aun aus b-u baa bab bac bad bah ban bas bau bba bbb bbc bbd bbh bbn bbs bbu bca bcb bcc bcd bch bcn bcs bcu bda bdb bdc bdd bdh bds bdu bha bhb bhc bhd bhh bhs bhu bna bnb bnc bnd bnn bns bnu bsa bsb bsc bsd bsh bsn bss bsu bua bub buc bud buh bun bus buu c-- caa cab cac cad cah can cas cau cba cbb cbc cbd cbh cbn cbs cbu cca ccb ccc ccd cch ccn ccs ccu cda cdb cdc cdd cdh cdn cds cdu ch- cha chb chc chd chh chn chs chu cn- cna cnb cnc cnd cnh cnn cns cnu csa csb csc csd csh csn css csu cua cub cuc cud cuh cun cus cuu daa dab dac dad dah dan das dau dba dbb dbc dbd dbh dbn dbs dbu dca dcb dcc dcd dcn dcs dcu dda ddb ddc ddd ddh ddn dds ddu dh- dha dhb dhc dhd dhh dhs dhu dna dnb dnc dnd dnh dnn dns dsa dsb dsc dsd dsh dsn dss dsu dua dub duc dud duh dun dus haa hab hac had hah han has hau hba hbb hbc hbd hbh hbn hbs hbu hca hcb hcc hcd hch hcn hcs hda hdb hdc hdd hdh hdn hds hdu hha hhb hhc hhd hhh hhn hhs hhu hna hnb hnc hnd hnh hnn hns hnu hsa hsb hsc hsd hsh hsn hss hsu hua hub huc hud huh hun hus huu naa nab nac nad nah nan nas nau nba nbb nbc nbd nbn nbs nbu nca ncb ncc ncd nch ncn ncs ncu nda ndb ndc ndd ndh ndn nds ndu nha nhb nhc nhd nhh nhn nhs nhu nna nnb nnc nnh nnn nns nnu nsa nsb nsc nsd nsh nsn nss nsu nua nub nuc nud nuh nun nus nuu saa sab sac sad sah san sas sau sba sbb sbc sbd sbh sbn sbs sbu sca scb scc scd sch scn scs scu sda sdb sdc sdd sdh sdn sds sdu sh- sha shb shc shd shh shn shs shu sna snb snc snd snn sns snu ss- ssa ssb ssc ssd ssh ssn sss ssu sua sub suc sud suh sun sus suu ua- uaa uab uac uad uah uan uas uau uba ubb ubc ubh ubn ubs ubu uca ucb ucc ucd uch ucn ucs ucu uda udb udc udd udn uds udu uha uhb uhc uhd uhh uhs uhu un- una unb unc und unh unn uns unu usa usb usc usd ush usn uss usu uua uuc uun uus uuu