-al -ol a-a a-b a-t aaa aab aag aal aao aat ab- aba abb abg abl abo abt ag- aga agb agg agl ago agt al- ala alb alg all alo alt aoa aob aog aol aoo aot at- ata atb atg atl ato att baa bab bag bal bao bat bba bbb bbg bbl bbo bbt bga bgb bgg bgl bgo bgt bla blb blg bll blo blt boa bob bog bol boo bot bta btb btg btl bto btt gaa gab gag gal gao gat gba gbg gbl gbo gbt gga ggb ggg ggo ggt gla glb glg gll glo glt goa gob gog gol goo got gta gtb gtg gtl gto gtt la- laa lab lag lal lao lat lba lbb lbg lbl lbo lbt lga lgb lgg lgl lgo lgt lla llb llg lll llo llt loa lob log lol loo lot lta ltb ltg ltl lto ltt oaa oab oag oal oao oat ob- oba obb obg obl obo obt oga ogg ogl ogo ogt ola olb olg oll olo olt oo- ooa oob oog ool ooo oot ot- ota otb otg otl oto ott taa tab tag tal tao tat tba tbb tbg tbl tbo tbt tga tgb tgg tgl tgo tgt tla tlg tll tlo tlt to- toa tob tog tol too tot tta ttb ttg ttl tto ttt