a-a a-b a-c a-q a-z aaa aab aac aak aaq aau aaz ab- aba abb abc abk abq abu abz ac- aca acb acc ack acq acu acz aka akb akc akk aku aqa aqc au- aua aub auc auk auz az- aza azb azq azu azz b-u baa bab bac bak baq bau baz bba bbb bbc bbk bbq bbu bca bcb bcc bck bcq bcu bcz bka bkb bkc bkk bkq bqc bua bub buc buk buu buz bza bzu bzz c-- caa cab cac cak caq cau caz cba cbb cbc cbk cbq cbu cbz cca ccb ccc cck ccu ccz cka ckb ckc cqa cqb cqc cua cub cuc cuk cuq cuu cuz cz- czc czk k-z ka- kaa kab kac kak kau kaz kba kbb kbc kbk kbu kbz kca kcb kcc kck kcu kkb kkc kkk kku kqa kub kuc kuk kuu qaa qac qau qaz qba qbc qbq qca qcc qqk qqq qqu qu- qua ua- uaa uab uac uak uaq uau uaz uba ubb ubc ubk ubu uca ucb ucc uck ucu uka ukb ukc ukk uku ukz uua uuc uuu uza uzb uzu zaa zab zac zak zaq zaz zbb zbc zcq zka zub zuc zuk zuz zzz