-al a-a a-b a-c a-t aaa aab aac aae aak aal aat ab- aba abb abc abe abk abl abt ac- aca acb acc ace ack acl act aea aeb aec aee aek ael aet aka akb akc ake akk akl al- ala alb alc ale alk all alt at- ata atb atc ate atl att baa bab bac bae bak bal bat bba bbb bbc bbe bbk bbl bbt bca bcb bcc bce bck bcl bct be- bea beb bec bee bek bel bet bka bkb bkc bke bkk bkl bkt bla blb blc ble blk bll blt bta btb btc bte btk btl btt c-- caa cab cac cae cak cal cat cba cbb cbc cbe cbk cbl cbt cca ccb ccc cce cck ccl cct ce- cea ceb cec cee cek cel cet cka ckb ckc ckt cl- cla clb clc cle clk cll clt cta ctb ctc cte ctk ctl ctt eaa eab eac eae eak eal eat eba ebb ebc ebe ebk ebl ebt ec- eca ecb ecc ece eck ecl ect eea eeb eec eee eek eel eet eka ekb ekc eke ekl ekt ela elb elc ele elk ell elt eta etb etc ete etk etl ett k-t ka- kaa kab kac kae kak kal kat kba kbb kbc kbe kbk kbl kca kcb kcc kce kck kcl kct ke- kea keb kec kee kek kel ket kkb kkc kke kkk kkl kkt kl- kla klb klc klt kta ktb ktc kte ktk ktl ktt la- laa lab lac lae lak lal lat lba lbb lbc lbe lbk lbl lbt lca lcb lcc lce lck lcl lct lea leb lec lee lek lel let lka lkb lkl lkt lla llb llc lle llk lll llt lta ltb ltc lte ltk ltl ltt taa tab tac tae tak tal tat tba tbb tbc tbe tbk tbl tbt tca tcb tcc tce tck tcl tct te- tea teb tec tee tek tel tet tka tkb tkc tke tkk tkl tkt tla tlc tle tlk tll tlt tta ttb ttc tte ttk ttl ttt