-al -ol a-a a-b a-c aaa aab aac aal aao aau ab- aba abb abc abl abo abu ac- aca acb acc acl aco acu al- ala alb alc all alo alu aoa aob aoc aol aoo aou au- aua aub auc aul auo b-u baa bab bac bal bao bau bba bbb bbc bbl bbo bbu bca bcb bcc bcl bco bcu bla blb blc bll blo blu boa bob boc bol boo bou bua bub buc bul buo buu c-- caa cab cac cal cao cau cba cbb cbc cbl cbo cbu cca ccb ccc ccl cco ccu cl- cla clb clc cll clo clu co- coa cob coc col coo cou cua cub cuc cul cuo cuu la- laa lab lac lal lao lau lba lbb lbc lbl lbo lbu lca lcb lcc lcl lco lcu lla llb llc lll llo llu loa lob loc lol loo lou lua lub luc lul luo luu oaa oab oac oal oao oau ob- oba obb obc obl obo obu oc- oca ocb occ ocl oco ocu ola olb olc oll olo olu oo- ooa oob ooc ool ooo ou- oua ouc oul ouo ua- uaa uab uac ual uao uau uba ubb ubc ubl ubo ubu uca ucb ucc ucl uco ucu ula ulb ulc ull ulo ulu uoa uob uoc uol uoo uua uuc uuu