-al -ol a-a a-b a-i a-t aaa aab aai aal aao aat ab- aba abb abi abl abo abt ai- aia aib aii ail aio ait al- ala alb ali all alo alt aoa aob aoi aol aoo aot at- ata atb ati atl ato att baa bab bai bal bao bat bba bbb bbi bbl bbo bbt bi- bia bib bii bil bio bit bla blb bli bll blo blt boa bob boi bol boo bot bta btb bti btl bto btt ia- iaa iab iai ial iao iat iba ibb ibi ibl ibo ibt iia iib iii iil iio iit il- ila ilb ili ill ilo ilt io- ioa iob ioi iol ioo iot ita itb iti itl ito itt la- laa lab lai lal lao lat lba lbb lbi lbl lbo lbt lia lib lii lil lio lit lla llb lli lll llo llt loa lob loi lol loo lot lta ltb lti ltl lto ltt o-i oaa oab oai oal oao oat ob- oba obb obi obl obo obt oia oib oii oil oio oit ola olb oli oll olo olt oo- ooa oob ooi ool ooo oot ot- ota otb oti otl oto ott taa tab tai tal tao tat tba tbb tbi tbl tbo tbt tia tib tii til tio tit tla tli tll tlo tlt to- toa tob toi tol too tot tta ttb tti ttl tto ttt