a-a a-b a-c aaa aab aac aad aae aan aas aau ab- aba abb abc abd abe abn abs abu ac- aca acb acc acd ace acn acs acu ad- ada adb adc add ade adn ads adu aea aeb aec aed aee aen aes aeu an- ana anb anc and ane ann ans anu as- asa asb asc asd ase asn ass asu au- aua aub auc aud aue aun aus b-u baa bab bac bad bae ban bas bau bba bbb bbc bbd bbe bbn bbs bbu bca bcb bcc bcd bce bcn bcs bcu bda bdb bdc bdd bde bds bdu be- bea beb bec bed bee ben bes beu bna bnb bnc bnd bne bnn bns bnu bsa bsb bsc bsd bse bsn bss bsu bua bub buc bud bue bun bus buu c-- caa cab cac cad cae can cas cau cba cbb cbc cbd cbe cbn cbs cbu cca ccb ccc ccd cce ccn ccs ccu cda cdb cdc cdd cde cdn cds cdu ce- cea ceb cec ced cee cen ces ceu cn- cna cnb cnc cnd cne cnn cns cnu csa csb csc csd cse csn css csu cua cub cuc cud cue cun cus cuu daa dab dac dad dae dan das dau dba dbb dbc dbd dbe dbn dbs dbu dca dcb dcc dcd dce dcn dcs dcu dda ddb ddc ddd dde ddn dds ddu de- dea deb dec ded dee den des deu dna dnb dnc dnd dne dnn dns dsa dsb dsc dsd dse dsn dss dsu dua dub duc dud due dun dus eaa eab eac ead eae ean eas eau eba ebb ebc ebd ebe ebn ebs ebu ec- eca ecb ecc ecd ece ecn ecs ecu ed- eda edb edc edd ede edn eds edu eea eeb eec eed eee een ees en- ena enb enc end ene enn ens enu es- esa esb esc esd ese esn ess esu eu- eua eub euc eud eue eun eus naa nab nac nad nae nan nas nau nba nbb nbc nbd nbe nbn nbs nbu nca ncb ncc ncd nce ncn ncs ncu nda ndb ndc ndd nde ndn nds ndu ne- nea neb nec ned nee nen nes neu nna nnb nnc nne nnn nns nnu nsa nsb nsc nsd nse nsn nss nsu nua nub nuc nud nue nun nus nuu saa sab sac sad sae san sas sau sba sbb sbc sbd sbe sbn sbs sbu sca scb scc scd sce scn scs scu sda sdb sdc sdd sde sdn sds sdu se- sea seb sec sed see sen ses seu sna snb snc snd sne snn sns snu ss- ssa ssb ssc ssd sse ssn sss ssu sua sub suc sud sue sun sus suu ua- uaa uab uac uad uae uan uas uau uba ubb ubc ube ubn ubs ubu uca ucb ucc ucd uce ucn ucs ucu uda udb udc udd ude udn uds udu uea ueb uec ued uee uen ues un- una unb unc und une unn uns unu usa usb usc usd use usn uss usu uua uuc uue uun uus uuu