-al a-a a-b a-c aaa aab aac aad aak aal aau ab- aba abb abc abd abk abl abu ac- aca acb acc acd ack acl acu ad- ada adb adc add adk adl adu aka akb akc akd akk akl aku al- ala alb alc ald alk all alu au- aua aub auc aud auk aul b-u baa bab bac bad bak bal bau bba bbb bbc bbd bbk bbl bbu bca bcb bcc bcd bck bcl bcu bda bdb bdc bdd bdk bdl bdu bka bkb bkc bkk bkl bla blb blc bld blk bll blu bua bub buc bud buk bul buu c-- caa cab cac cad cak cal cau cba cbb cbc cbd cbk cbl cbu cca ccb ccc ccd cck ccl ccu cda cdb cdc cdd cdk cdl cdu cka ckb ckc ckd cl- cla clb clc cld clk cll clu cua cub cuc cud cuk cul cuu daa dab dac dad dak dal dau dba dbb dbc dbd dbk dbl dbu dca dcb dcc dcd dck dcl dcu dda ddb ddc ddd ddk ddl ddu dka dkb dkc dkk dkl dku dl- dla dlb dlc dld dlk dll dlu dua dub duc dud duk dul ka- kaa kab kac kad kak kal kau kba kbb kbc kbd kbk kbl kbu kca kcb kcc kcd kck kcl kcu kda kdb kdc kdk kdl kdu kkb kkc kkk kkl kku kl- kla klb klc kld klu kub kuc kud kuk kul kuu la- laa lab lac lad lak lal lau lba lbb lbc lbd lbk lbl lbu lca lcb lcc lcd lck lcl lcu lda ldb ldc ldd ldk ldl ldu lka lkb lkl lla llb llc lld llk lll llu lua lub luc lud luk lul luu ua- uaa uab uac uad uak ual uau uba ubb ubc ubk ubl ubu uca ucb ucc ucd uck ucl ucu uda udb udc udd udk udl udu uka ukb ukc ukk ukl uku ula ulb ulc uld ulk ull ulu uua uuc uuu