-al -ol a-a a-b aaa aab aad aal aan aao ab- aba abb abd abl abn abo ad- ada adb add adl adn ado al- ala alb ald all aln alo an- ana anb and anl ann ano aoa aob aod aol aon aoo baa bab bad bal ban bao bba bbb bbd bbl bbn bbo bda bdb bdd bdl bdo bla blb bld bll bln blo bna bnb bnd bnl bnn bno boa bob bod bol bon boo daa dab dad dal dan dao dba dbb dbd dbl dbn dbo dda ddb ddd ddl ddn ddo dl- dla dlb dld dll dlo dna dnb dnd dnl dnn dno doa dob dod dol don doo la- laa lab lad lal lan lao lba lbb lbd lbl lbo lda ldb ldd ldl ldn ldo lla llb lld lll lln llo lna lnb lnd lnl lnn lno loa lob lod lol lon loo naa nab nad nal nan nao nba nbb nbd nbl nbn nbo nda ndb ndd ndl ndn ndo nla nlb nld nll nln nlo nna nnb nnl nnn nno no- noa nob nod nol non noo oaa oab oad oal oan oao ob- oba obb obd obl obn obo oda odb odd odl odn odo ola olb old oll oln olo on- ona onb ond onl onn ono oo- ooa oob ood ool oon ooo