a-a a-b a-c aaa aab aac aam aas aau ab- aba abb abc abm abs abu ac- aca acb acc acm acs acu ama amb amc amm ams amu as- asa asb asc asm ass asu au- aua aub auc aum aus b-u baa bab bac bam bas bau bba bbb bbc bbm bbs bbu bca bcb bcc bcm bcs bcu bma bmb bmc bmm bms bmu bsa bsb bsc bsm bss bsu bua bub buc bum bus buu c-- caa cab cac cam cas cau cba cbb cbc cbm cbs cbu cca ccb ccc ccm ccs ccu cma cmb cmc cmm cms cmu csa csb csc csm css csu cua cub cuc cum cus cuu maa mab mac mam mas mau mba mbb mbc mbm mbs mbu mc- mca mcb mcc mcm mcs mcu mma mmb mmc mmm mms mmu msa msb msc msm mss msu mua mub muc mum mus muu saa sab sac sam sas sau sba sbb sbc sbm sbs sbu sca scb scc scm scs scu sma smb smc smm sms smu ss- ssa ssb ssc ssm sss ssu sua sub suc sum sus suu ua- uaa uab uac uam uas uau uba ubb ubc ubs ubu uca ucb ucc ucm ucs ucu um- uma umb umc umm ums umu usa usb usc usm uss usu uua uuc uum uus uuu