a-a a-b a-c aaa aab aac aam aan aas aau ab- aba abb abc abm abn abs abu ac- aca acb acc acm acn acs acu ama amb amc amm amn ams amu an- ana anb anc anm ann ans anu as- asa asb asc asm asn ass asu au- aua aub auc aum aun aus b-u baa bab bac bam ban bas bau bba bbb bbc bbm bbn bbs bbu bca bcb bcc bcm bcn bcs bcu bma bmb bmc bmm bmn bms bmu bna bnb bnc bnn bns bnu bsa bsb bsc bsm bsn bss bsu bua bub buc bum bun bus buu c-- caa cab cac cam can cas cau cba cbb cbc cbm cbn cbs cbu cca ccb ccc ccm ccn ccs ccu cma cmb cmc cmm cmn cms cmu cn- cna cnb cnc cnm cnn cns cnu csa csb csc csm csn css csu cua cub cuc cum cun cus cuu maa mab mac mam man mas mau mba mbb mbc mbm mbs mbu mc- mca mcb mcc mcm mcn mcs mcu mma mmb mmc mmm mmn mms mmu mna mnb mnc mnm mnn mns mnu msa msb msc msm msn mss msu mua mub muc mum mun mus muu naa nab nac nam nan nas nau nba nbb nbc nbm nbn nbs nbu nca ncb ncc ncm ncn ncs ncu nma nmb nmc nmm nmn nms nmu nna nnb nnc nnm nnn nns nnu nsa nsb nsc nsm nsn nss nsu nua nub nuc num nun nus nuu saa sab sac sam san sas sau sba sbb sbc sbm sbn sbs sbu sca scb scc scm scn scs scu sma smb smc smm smn sms smu sna snb snc snm snn sns snu ss- ssa ssb ssc ssm ssn sss ssu sua sub suc sum sun sus suu ua- uaa uab uac uam uan uas uau uba ubb ubc ubn ubs ubu uca ucb ucc ucm ucn ucs ucu um- uma umb umc umm umn ums umu un- una unb unc unm unn uns unu usa usb usc usm usn uss usu uua uuc uum uun uus uuu