-al a-a a-b a-c a-t aaa aab aac aae aak aal aan aat ab- aba abb abc abe abk abl abn abt ac- aca acb acc ace ack acl acn act aea aeb aec aee aek ael aen aet aka akb akc ake akk akl akn al- ala alb alc ale alk all aln alt an- ana anb anc ane ank anl ann ant at- ata atb atc ate atl atn att baa bab bac bae bak bal ban bat bba bbb bbc bbe bbk bbl bbn bbt bca bcb bcc bce bck bcl bcn bct be- bea beb bec bee bek bel ben bet bka bkb bkc bke bkk bkl bkn bkt bla blb blc ble blk bll bln blt bna bnb bnc bne bnk bnl bnn bnt bta btb btc bte btk btl btn btt c-- caa cab cac cae cak cal can cat cba cbb cbc cbe cbk cbl cbn cbt cca ccb ccc cce cck ccl ccn cct ce- cea ceb cec cee cek cel cen cet cka ckb ckc ckt cl- cla clb clc cle clk cll cln clt cn- cna cnb cnc cne cnl cnn cnt cta ctb ctc cte ctk ctl ctn ctt eaa eab eac eae eak eal ean eat eba ebb ebc ebe ebk ebl ebn ebt ec- eca ecb ecc ece eck ecl ecn ect eea eeb eec eee eek eel een eet eka ekb ekc eke ekl ekt ela elb elc ele elk ell eln elt en- ena enb enc ene enk enl enn ent eta etb etc ete etk etl etn ett k-t ka- kaa kab kac kae kak kal kan kat kba kbb kbc kbe kbk kbl kbn kca kcb kcc kce kck kcl kcn kct ke- kea keb kec kee kek kel ken ket kkb kkc kke kkk kkl kkn kkt kl- kla klb klc klt kn- kna knc kne knk knl knn knt kta ktb ktc kte ktk ktl ktn ktt la- laa lab lac lae lak lal lan lat lba lbb lbc lbe lbk lbl lbt lca lcb lcc lce lck lcl lcn lct lea leb lec lee lek lel len let lka lkb lkl lkt lla llb llc lle llk lll lln llt lna lnb lnc lne lnk lnl lnn lnt lta ltb ltc lte ltk ltl ltt naa nab nac nae nak nal nan nat nba nbb nbc nbe nbk nbl nbn nbt nca ncb ncc nce nck ncl ncn nct ne- nea neb nec nee nek nel nen net nka nkc nke nkk nkn nkt nla nlb nlc nle nlk nll nln nlt nna nnb nnc nne nnk nnl nnn nnt nta ntb ntc nte ntk ntn ntt taa tab tac tae tak tal tan tat tba tbb tbc tbe tbk tbl tbn tbt tca tcb tcc tce tck tcl tcn tct te- tea teb tec tee tek tel ten tet tka tkb tkc tke tkk tkl tkt tla tlc tle tlk tll tln tlt tna tnb tnc tne tnk tnl tnn tnt tta ttb ttc tte ttk ttl ttn ttt