-al a-a a-b a-t aaa aab aad aal aan aat ab- aba abb abd abl abn abt ad- ada adb add adl adn adt al- ala alb ald all aln alt an- ana anb and anl ann ant at- ata atb atd atl atn att baa bab bad bal ban bat bba bbb bbd bbl bbn bbt bda bdb bdd bdl bdt bla blb bld bll bln blt bna bnb bnd bnl bnn bnt bta btb btd btl btn btt daa dab dad dal dan dat dba dbb dbd dbl dbn dbt dda ddb ddd ddl ddn ddt dl- dla dlb dld dll dlt dna dnb dnd dnl dnn dnt dta dtb dtd dtl dtn dtt la- laa lab lad lal lan lat lba lbb lbd lbl lbt lda ldb ldd ldl ldn ldt lla llb lld lll lln llt lna lnb lnd lnl lnn lnt lta ltb ltd ltl ltt naa nab nad nal nan nat nba nbb nbd nbl nbn nbt nda ndb ndd ndl ndn ndt nla nlb nld nll nln nlt nna nnb nnl nnn nnt nta ntb ntd ntn ntt taa tab tad tal tan tat tba tbb tbd tbl tbn tbt tda tdb tdd tdl tdn tdt tla tld tll tln tlt tna tnb tnd tnl tnn tnt tta ttb ttd ttl ttn ttt