-al a-a a-b aaa aab aad aal aan ab- aba abb abd abl abn ad- ada adb add adl adn al- ala alb ald all aln an- ana anb and anl ann baa bab bad bal ban bba bbb bbd bbl bbn bda bdb bdd bdl bla blb bld bll bln bna bnb bnd bnl bnn daa dab dad dal dan dba dbb dbd dbl dbn dda ddb ddd ddl ddn dl- dla dlb dld dll dna dnb dnd dnl dnn la- laa lab lad lal lan lba lbb lbd lbl lda ldb ldd ldl ldn lla llb lld lll lln lna lnb lnd lnl lnn naa nab nad nal nan nba nbb nbd nbl nbn nda ndb ndd ndl ndn nla nlb nld nll nln nna nnb nnl nnn