-al -ol a-a a-b aaa aab aag aal aao ab- aba abb abg abl abo ag- aga agb agg agl ago al- ala alb alg all alo aoa aob aog aol aoo baa bab bag bal bao bba bbb bbg bbl bbo bga bgb bgg bgl bgo bla blb blg bll blo boa bob bog bol boo gaa gab gag gal gao gba gbg gbl gbo gga ggb ggg ggo gla glb glg gll glo goa gob gog gol goo la- laa lab lag lal lao lba lbb lbg lbl lbo lga lgb lgg lgl lgo lla llb llg lll llo loa lob log lol loo oaa oab oag oal oao ob- oba obb obg obl obo oga ogg ogl ogo ola olb olg oll olo oo- ooa oob oog ool ooo