a-a a-b a-c aaa aab aac aam aau aax ab- aba abb abc abm abu abx ac- aca acb acc acm acu acx ama amb amc amm amu amx au- aua aub auc aum aux ax- axa axm axx b-u baa bab bac bam bau bax bba bbb bbc bbm bbu bbx bca bcb bcc bcm bcu bcx bma bmb bmc bmm bmu bmx bua bub buc bum buu bux bxb bxm bxx c-- caa cab cac cam cau cax cba cbb cbc cbm cbu cbx cca ccb ccc ccm ccu ccx cma cmb cmc cmm cmu cmx cua cub cuc cum cuu cxc cxx maa mab mac mam mau max mba mbb mbc mbm mbu mbx mc- mca mcb mcc mcm mcu mcx mma mmb mmc mmm mmu mmx mua mub muc mum muu mux mxa mxc mxu ua- uaa uab uac uam uau uba ubb ubc ubu ubx uca ucb ucc ucm ucu um- uma umb umc umm umu uua uuc uum uuu uxb uxc uxu xaa xac xam xau xbc xbx xcb xcx xma xmc xmm xmu xmx xxx