-al -ol a-a a-b a-t aaa aab aad aal aao aat ab- aba abb abd abl abo abt ad- ada adb add adl ado adt al- ala alb ald all alo alt aoa aob aod aol aoo aot at- ata atb atd atl ato att baa bab bad bal bao bat bba bbb bbd bbl bbo bbt bda bdb bdd bdl bdo bdt bla blb bld bll blo blt boa bob bod bol boo bot bta btb btd btl bto btt daa dab dad dal dao dat dba dbb dbd dbl dbo dbt dda ddb ddd ddl ddo ddt dl- dla dlb dld dll dlo dlt doa dob dod dol doo dot dta dtb dtd dtl dto dtt la- laa lab lad lal lao lat lba lbb lbd lbl lbo lbt lda ldb ldd ldl ldo ldt lla llb lld lll llo llt loa lob lod lol loo lot lta ltb ltd ltl lto ltt oaa oab oad oal oao oat ob- oba obb obd obl obo obt oda odb odd odl odo odt ola olb old oll olo olt oo- ooa oob ood ool ooo oot ot- ota otb otd otl oto ott taa tab tad tal tao tat tba tbb tbd tbl tbo tbt tda tdb tdd tdl tdo tdt tla tld tll tlo tlt to- toa tob tod tol too tot tta ttb ttd ttl tto ttt