-al a-a a-b a-c aaa aab aac aak aal aau ab- aba abb abc abk abl abu ac- aca acb acc ack acl acu aka akb akc akk akl aku al- ala alb alc alk all alu au- aua aub auc auk aul b-u baa bab bac bak bal bau bba bbb bbc bbk bbl bbu bca bcb bcc bck bcl bcu bka bkb bkc bkk bkl bla blb blc blk bll blu bua bub buc buk bul buu c-- caa cab cac cak cal cau cba cbb cbc cbk cbl cbu cca ccb ccc cck ccl ccu cka ckb ckc cl- cla clb clc clk cll clu cua cub cuc cuk cul cuu ka- kaa kab kac kak kal kau kba kbb kbc kbk kbl kbu kca kcb kcc kck kcl kcu kkb kkc kkk kkl kku kl- kla klb klc klu kub kuc kuk kul kuu la- laa lab lac lak lal lau lba lbb lbc lbk lbl lbu lca lcb lcc lck lcl lcu lka lkb lkl lla llb llc llk lll llu lua lub luc luk lul luu ua- uaa uab uac uak ual uau uba ubb ubc ubk ubl ubu uca ucb ucc uck ucl ucu uka ukb ukc ukk ukl uku ula ulb ulc ulk ull ulu uua uuc uuu