-al a-a a-b a-c aaa aab aac aaf aak aal aau ab- aba abb abc abf abk abl abu ac- aca acb acc acf ack acl acu af- afa afb afc aff afk afl afu aka akb akc akk akl aku al- ala alb alc alf alk all alu au- aua aub auc auf auk aul b-u baa bab bac baf bak bal bau bba bbb bbc bbf bbk bbl bbu bca bcb bcc bcf bck bcl bcu bfa bfb bfc bff bfl bfu bka bkb bkc bkf bkk bkl bla blb blc blf blk bll blu bua bub buc buf buk bul buu c-- caa cab cac caf cak cal cau cba cbb cbc cbf cbk cbl cbu cca ccb ccc ccf cck ccl ccu cfa cfb cfc cff cfk cfl cfu cka ckb ckc cl- cla clb clc clf clk cll clu cua cub cuc cuf cuk cul cuu faa fab fac faf fak fal fau fba fbb fbc fbf fbk fbl fbu fca fcb fcc fcf fck fcl fcu ffa ffc fff ffk ffl ffu fka fkb fkc fkf fkk fkl fla flb flc flf fll flu fua fub fuf fuk ful fuu ka- kaa kab kac kaf kak kal kau kba kbb kbc kbf kbk kbl kbu kca kcb kcc kck kcl kcu kfa kfc kff kfu kkb kkc kkk kkl kku kl- kla klb klc klf klu kub kuc kuk kul kuu la- laa lab lac laf lak lal lau lba lbb lbc lbf lbk lbl lbu lca lcb lcc lcf lck lcl lcu lfa lfb lfc lff lfk lfl lfu lka lkb lkl lla llb llc llf llk lll llu lua lub luc luf luk lul luu ua- uaa uab uac uaf uak ual uau uba ubb ubc ubf ubk ubl ubu uca ucb ucc ucf uck ucl ucu ufa ufc uff ufl ufu uka ukb ukc ukf ukk ukl uku ula ulb ulc ulf ulk ull ulu uua uuc uuu