-al a-a a-b aaa aab aad aae aal aan ab- aba abb abd abe abl abn ad- ada adb add ade adl adn aea aeb aed aee ael aen al- ala alb ald ale all aln an- ana anb and ane anl ann baa bab bad bae bal ban bba bbb bbd bbe bbl bbn bda bdb bdd bde bdl be- bea beb bed bee bel ben bla blb bld ble bll bln bna bnb bnd bne bnl bnn daa dab dad dae dal dan dba dbb dbd dbe dbl dbn dda ddb ddd dde ddl ddn de- dea deb ded dee del den dl- dla dlb dld dle dll dna dnb dnd dne dnl dnn eaa eab ead eae eal ean eba ebb ebd ebe ebl ebn ed- eda edb edd ede edl edn eea eeb eed eee eel een ela elb eld ele ell eln en- ena enb end ene enl enn la- laa lab lad lae lal lan lba lbb lbd lbe lbl lda ldb ldd lde ldl ldn lea leb led lee lel len lla llb lld lle lll lln lna lnb lnd lne lnl lnn naa nab nad nae nal nan nba nbb nbd nbe nbl nbn nda ndb ndd nde ndl ndn ne- nea neb ned nee nel nen nla nlb nld nle nll nln nna nnb nne nnl nnn