-al -ol a-a a-b aaa aab aag aal aan aao ab- aba abb abg abl abn abo ag- aga agb agg agl agn ago al- ala alb alg all aln alo an- ana anb ang anl ann ano aoa aob aog aol aon aoo baa bab bag bal ban bao bba bbb bbg bbl bbn bbo bga bgb bgg bgl bgn bgo bla blb blg bll bln blo bna bnb bng bnl bnn bno boa bob bog bol bon boo gaa gab gag gal gan gao gba gbg gbl gbn gbo gga ggb ggg ggn ggo gla glb glg gll gln glo gna gnb gnl gnn gno goa gob gog gol gon goo la- laa lab lag lal lan lao lba lbb lbg lbl lbo lga lgb lgg lgl lgn lgo lla llb llg lll lln llo lna lnb lng lnl lnn lno loa lob log lol lon loo naa nab nag nal nan nao nba nbb nbg nbl nbn nbo nga ngb ngg ngl ngn ngo nla nlb nlg nll nln nlo nna nnb nng nnl nnn nno no- noa nob nog nol non noo oaa oab oag oal oan oao ob- oba obb obg obl obn obo oga ogg ogl ogn ogo ola olb olg oll oln olo on- ona onb ong onl onn ono oo- ooa oob oog ool oon ooo