-al a-a a-b a-c aaa aab aac aag aal aar aau ab- aba abb abc abg abl abr abu ac- aca acb acc acg acl acr acu ag- aga agb agc agg agl agr agu al- ala alb alc alg all alr alu ar- ara arb arc arg arl arr aru au- aua aub auc aug aul aur b-u baa bab bac bag bal bar bau bba bbb bbc bbg bbl bbr bbu bca bcb bcc bcg bcl bcr bcu bga bgb bgc bgg bgl bgr bgu bla blb blc blg bll blr blu bra brb brg brl brr bru bua bub buc bug bul bur buu c-- caa cab cac cag cal car cau cba cbb cbc cbg cbl cbr cbu cca ccb ccc ccg ccl ccr ccu cga cgb cgc cgg cgl cgr cgu cl- cla clb clc clg cll clr clu cra crb crc crg crl crr cru cua cub cuc cug cul cur cuu gaa gab gac gag gal gar gau gba gbc gbg gbl gbr gbu gca gcb gcc gcg gcl gcr gcu gga ggb ggc ggg ggr ggu gla glb glc glg gll glr glu gra grb grc grg grl grr gru gu- gua gub guc gug gul gur guu la- laa lab lac lag lal lar lau lba lbb lbc lbg lbl lbr lbu lca lcb lcc lcg lcl lcr lcu lga lgb lgc lgg lgl lgr lgu lla llb llc llg lll llr llu lra lrb lrc lrg lrr lru lua lub luc lug lul lur luu ra- raa rab rac rag ral rar rau rba rbb rbc rbg rbl rbr rbu rca rcb rcc rcg rcl rcr rcu rga rgb rgc rgg rgr rla rlc rlg rll rlr rlu rra rrb rrc rrg rrl rrr rru rua rub ruc rug rur ruu ua- uaa uab uac uag ual uar uau uba ubb ubc ubg ubl ubr ubu uca ucb ucc ucg ucl ucr ucu uga ugb ugc ugg ugl ugr ugu ula ulb ulc ulg ull ulr ulu ur- ura urb urc urg url urr uru uua uuc uug uur uuu