a-a a-b a-c aaa aab aac aae aam aao aas aau ab- aba abb abc abe abm abo abs abu ac- aca acb acc ace acm aco acs acu aea aeb aec aee aem aeo aes aeu ama amb amc ame amm amo ams amu aoa aob aoc aoe aom aoo aos aou as- asa asb asc ase asm aso ass asu au- aua aub auc aue aum auo aus b-u baa bab bac bae bam bao bas bau bba bbb bbc bbe bbm bbo bbs bbu bca bcb bcc bce bcm bco bcs bcu be- bea beb bec bee bem beo bes beu bma bmb bmc bme bmm bmo bms bmu boa bob boc boe bom boo bos bou bsa bsb bsc bse bsm bso bss bsu bua bub buc bue bum buo bus buu c-- caa cab cac cae cam cao cas cau cba cbb cbc cbe cbm cbo cbs cbu cca ccb ccc cce ccm cco ccs ccu ce- cea ceb cec cee cem ceo ces ceu cma cmb cmc cme cmm cmo cms cmu co- coa cob coc coe com coo cos cou csa csb csc cse csm cso css csu cua cub cuc cue cum cuo cus cuu eaa eab eac eae eam eao eas eau eba ebb ebc ebe ebm ebo ebs ebu ec- eca ecb ecc ece ecm eco ecs ecu eea eeb eec eee eem eeo ees em- ema emb emc eme emm emo ems emu eo- eoa eob eoc eoe eom eoo eos eou es- esa esb esc ese esm eso ess esu eu- eua eub euc eue eus m-o maa mab mac mae mam mao mas mau mba mbb mbc mbe mbm mbo mbs mbu mc- mca mcb mcc mce mcm mco mcs mcu mea meb mec mee mem meo mes meu mma mmb mmc mme mmm mmo mms mmu moa mob moc moe mom moo mos mou msa msb msc mse msm mso mss msu mua mub muc mue mum mus muu oaa oab oac oae oam oao oas oau ob- oba obb obc obe obm obo obs obu oc- oca ocb occ ocm oco ocs ocu oea oeb oec oee oem oeo oes om- oma omb omc ome omm omo oms omu oo- ooa oob ooc oom ooo oos os- osa osb osc ose osm oso oss osu ou- oua ouc oue oum ouo ous saa sab sac sae sam sao sas sau sba sbb sbc sbe sbm sbo sbs sbu sca scb scc sce scm sco scs scu se- sea seb sec see sem seo ses seu sma smb smc sme smm smo sms smu soa sob soc soe som soo sos sou ss- ssa ssb ssc sse ssm sso sss ssu sua sub suc sue sum suo sus suu ua- uaa uab uac uae uam uao uas uau uba ubb ubc ube ubo ubs ubu uca ucb ucc uce ucm uco ucs ucu uea ueb uec uee uem ues um- uma umb umc ume umm umo ums umu uoa uob uoc uoe uom uoo uos usa usb usc use usm uso uss usu uua uuc uue uum uus uuu