-al a-a a-b a-c a-t aaa aab aac aae aal aan aat ab- aba abb abc abe abl abn abt ac- aca acb acc ace acl acn act aea aeb aec aee ael aen aet al- ala alb alc ale all aln alt an- ana anb anc ane anl ann ant at- ata atb atc ate atl atn att baa bab bac bae bal ban bat bba bbb bbc bbe bbl bbn bbt bca bcb bcc bce bcl bcn bct be- bea beb bec bee bel ben bet bla blb blc ble bll bln blt bna bnb bnc bne bnl bnn bnt bta btb btc bte btl btn btt c-- caa cab cac cae cal can cat cba cbb cbc cbe cbl cbn cbt cca ccb ccc cce ccl ccn cct ce- cea ceb cec cee cel cen cet cl- cla clb clc cle cll cln clt cn- cna cnb cnc cne cnl cnn cnt cta ctb ctc cte ctl ctn ctt eaa eab eac eae eal ean eat eba ebb ebc ebe ebl ebn ebt ec- eca ecb ecc ece ecl ecn ect eea eeb eec eee eel een eet ela elb elc ele ell eln elt en- ena enb enc ene enl enn ent eta etb etc ete etl etn ett la- laa lab lac lae lal lan lat lba lbb lbc lbe lbl lbt lca lcb lcc lce lcl lcn lct lea leb lec lee lel len let lla llb llc lle lll lln llt lna lnb lnc lne lnl lnn lnt lta ltb ltc lte ltl ltt naa nab nac nae nal nan nat nba nbb nbc nbe nbl nbn nbt nca ncb ncc nce ncl ncn nct ne- nea neb nec nee nel nen net nla nlb nlc nle nll nln nlt nna nnb nnc nne nnl nnn nnt nta ntb ntc nte ntn ntt taa tab tac tae tal tan tat tba tbb tbc tbe tbl tbn tbt tca tcb tcc tce tcl tcn tct te- tea teb tec tee tel ten tet tla tlc tle tll tln tlt tna tnb tnc tne tnl tnn tnt tta ttb ttc tte ttl ttn ttt