-al -ol a-a a-b a-t aaa aab aad aal aan aao aat ab- aba abb abd abl abn abo abt ad- ada adb add adl adn ado adt al- ala alb ald all aln alo alt an- ana anb and anl ann ano ant aoa aob aod aol aon aoo aot at- ata atb atd atl atn ato att baa bab bad bal ban bao bat bba bbb bbd bbl bbn bbo bbt bda bdb bdd bdl bdo bdt bla blb bld bll bln blo blt bna bnb bnd bnl bnn bno bnt boa bob bod bol bon boo bot bta btb btd btl btn bto btt daa dab dad dal dan dao dat dba dbb dbd dbl dbn dbo dbt dda ddb ddd ddl ddn ddo ddt dl- dla dlb dld dll dlo dlt dna dnb dnd dnl dnn dno dnt doa dob dod dol don doo dot dta dtb dtd dtl dtn dto dtt la- laa lab lad lal lan lao lat lba lbb lbd lbl lbo lbt lda ldb ldd ldl ldn ldo ldt lla llb lld lll lln llo llt lna lnb lnd lnl lnn lno lnt loa lob lod lol lon loo lot lta ltb ltd ltl lto ltt naa nab nad nal nan nao nat nba nbb nbd nbl nbn nbo nbt nda ndb ndd ndl ndn ndo ndt nla nlb nld nll nln nlo nlt nna nnb nnl nnn nno nnt no- noa nob nod nol non noo not nta ntb ntd ntn nto ntt oaa oab oad oal oan oao oat ob- oba obb obd obl obn obo obt oda odb odd odl odn odo odt ola olb old oll oln olo olt on- ona onb ond onl onn ono ont oo- ooa oob ood ool oon ooo oot ot- ota otb otd otl otn oto ott taa tab tad tal tan tao tat tba tbb tbd tbl tbn tbo tbt tda tdb tdd tdl tdn tdo tdt tla tld tll tln tlo tlt tna tnb tnd tnl tnn tno tnt to- toa tob tod tol ton too tot tta ttb ttd ttl ttn tto ttt