-al -ol a-a a-b a-t aaa aab aae aal aao aat ab- aba abb abe abl abo abt aea aeb aee ael aeo aet al- ala alb ale all alo alt aoa aob aoe aol aoo aot at- ata atb ate atl ato att baa bab bae bal bao bat bba bbb bbe bbl bbo bbt be- bea beb bee bel beo bet bla blb ble bll blo blt boa bob boe bol boo bot bta btb bte btl bto btt eaa eab eae eal eao eat eba ebb ebe ebl ebo ebt eea eeb eee eel eeo eet ela elb ele ell elo elt eo- eoa eob eoe eol eoo eot eta etb ete etl eto ett la- laa lab lae lal lao lat lba lbb lbe lbl lbo lbt lea leb lee lel leo let lla llb lle lll llo llt loa lob loe lol loo lot lta ltb lte ltl lto ltt oaa oab oae oal oao oat ob- oba obb obe obl obo obt oea oeb oee oel oeo oet ola olb ole oll olo olt oo- ooa oob ool ooo oot ot- ota otb ote otl oto ott taa tab tae tal tao tat tba tbb tbe tbl tbo tbt te- tea teb tee tel teo tet tla tle tll tlo tlt to- toa tob toe tol too tot tta ttb tte ttl tto ttt