a-a a-b a-c a-z aaa aab aac aak aam aau aaz ab- aba abb abc abk abm abu abz ac- aca acb acc ack acm acu acz aka akb akc akk akm aku ama amb amc amk amm amu amz au- aua aub auc auk aum auz az- aza azb azm azu azz b-u baa bab bac bak bam bau baz bba bbb bbc bbk bbm bbu bca bcb bcc bck bcm bcu bcz bka bkb bkc bkk bkm bma bmb bmc bmk bmm bmu bmz bua bub buc buk bum buu buz bza bzu bzz c-- caa cab cac cak cam cau caz cba cbb cbc cbk cbm cbu cbz cca ccb ccc cck ccm ccu ccz cka ckb ckc ckm cma cmb cmc cmk cmm cmu cua cub cuc cuk cum cuu cuz cz- czc czk czm k-z ka- kaa kab kac kak kam kau kaz kba kbb kbc kbk kbm kbu kbz kca kcb kcc kck kcm kcu kkb kkc kkk kkm kku kma kmb kmc kmk kmm kmu kmz kub kuc kuk kum kuu maa mab mac mak mam mau maz mba mbb mbc mbk mbm mbu mc- mca mcb mcc mck mcm mcu mcz mka mkb mkc mkk mkm mku mkz mma mmb mmc mmk mmm mmu mmz mua mub muc muk mum muu mza mzb mzm ua- uaa uab uac uak uam uau uaz uba ubb ubc ubk ubu uca ucb ucc uck ucm ucu uka ukb ukc ukk uku ukz um- uma umb umc umm umu uua uuc uum uuu uza uzb uzu zaa zab zac zak zam zaz zbb zbc zbm zka zma zmb zmc zmk zmm zub zuc zuk zum zuz zzz