-er a-a a-b a-c aaa aab aac aae aam aar aas aau ab- aba abb abc abe abm abr abs abu ac- aca acb acc ace acm acr acs acu aea aeb aec aee aem aer aes aeu ama amb amc ame amm amr ams amu ar- ara arb arc are arm arr ars aru as- asa asb asc ase asm asr ass asu au- aua aub auc aue aum aur aus b-u baa bab bac bae bam bar bas bau bba bbb bbc bbe bbm bbr bbs bbu bca bcb bcc bce bcm bcr bcs bcu be- bea beb bec bee bem ber bes beu bma bmb bmc bme bmm bmr bms bmu bra brb bre brm brr brs bru bsa bsb bsc bse bsm bsr bss bsu bua bub buc bue bum bur bus buu c-- caa cab cac cae cam car cas cau cba cbb cbc cbe cbm cbr cbs cbu cca ccb ccc cce ccm ccr ccs ccu ce- cea ceb cec cee cem cer ces ceu cma cmb cmc cme cmm cmr cms cmu cra crb crc cre crm crr crs cru csa csb csc cse csm csr css csu cua cub cuc cue cum cur cus cuu eaa eab eac eae eam ear eas eau eba ebb ebc ebe ebm ebr ebs ebu ec- eca ecb ecc ece ecm ecr ecs ecu eea eeb eec eee eem eer ees em- ema emb emc eme emm emr ems emu era erb erc ere erm err ers eru es- esa esb esc ese esm esr ess esu eu- eua eub euc eue eur eus m-r maa mab mac mae mam mar mas mau mba mbb mbc mbe mbm mbr mbs mbu mc- mca mcb mcc mce mcm mcr mcs mcu mea meb mec mee mem mer mes meu mma mmb mmc mme mmm mmr mms mmu mra mrb mrc mre mrm mrr mrs mru msa msb msc mse msm msr mss msu mua mub muc mue mum mur mus muu ra- raa rab rac rae ram rar ras rau rba rbb rbc rbe rbm rbr rbs rbu rca rcb rcc rce rcm rcr rcs rcu re- rea reb rec ree rem rer res reu rma rmb rmc rme rmm rmr rms rra rrb rrc rrm rrr rrs rru rsa rsb rsc rse rsm rsr rss rsu rua rub ruc rue rum rur rus ruu saa sab sac sae sam sar sas sau sba sbb sbc sbe sbm sbr sbs sbu sca scb scc sce scm scr scs scu se- sea seb sec see sem ser ses seu sma smb smc sme smm smr sms smu sr- sra srb src sre srm srr srs ss- ssa ssb ssc sse ssm ssr sss ssu sua sub suc sue sum sur sus suu ua- uaa uab uac uae uam uar uas uau uba ubb ubc ube ubr ubs ubu uca ucb ucc uce ucm ucr ucs ucu uea ueb uec uee uem uer ues um- uma umb umc ume umm umr ums umu ur- ura urb urc ure urm urr urs uru usa usb usc use usm usr uss usu uua uuc uue uum uur uus uuu