-al -ol a-a a-b a-c a-t aaa aab aac aaf aak aal aao aat ab- aba abb abc abf abk abl abo abt ac- aca acb acc acf ack acl aco act af- afa afb afc aff afk afl afo aft aka akb akc akk akl ako al- ala alb alc alf alk all alo alt aoa aob aoc aof aok aol aoo aot at- ata atb atc atf atl ato att baa bab bac baf bak bal bao bat bba bbb bbc bbf bbk bbl bbo bbt bca bcb bcc bcf bck bcl bco bct bfa bfb bfc bff bfl bfo bft bka bkb bkc bkf bkk bkl bko bkt bla blb blc blf blk bll blo blt boa bob boc bof bok bol boo bot bta btb btc btf btk btl bto btt c-- caa cab cac caf cak cal cao cat cba cbb cbc cbf cbk cbl cbo cbt cca ccb ccc ccf cck ccl cco cct cfa cfb cfc cff cfk cfl cfo cft cka ckb ckc cko ckt cl- cla clb clc clf clk cll clo clt co- coa cob coc cof cok col coo cot cta ctb ctc ctf ctk ctl cto ctt faa fab fac faf fak fal fao fat fba fbb fbc fbf fbk fbl fbo fbt fca fcb fcc fcf fck fcl fco fct ffa ffc fff ffk ffl ffo fft fka fkb fkc fkf fkk fkl fkt fla flb flc flf fll flo flt foa fob foc fof fok fol foo fot fta ftb ftc ftf ftk ftl fto ftt k-t ka- kaa kab kac kaf kak kal kao kat kba kbb kbc kbf kbk kbl kbo kca kcb kcc kck kcl kct kfa kfc kff kfo kkb kkc kkk kkl kkt kl- kla klb klc klf klo klt koa kob koc kof kok kol koo kot kta ktb ktc ktf ktk ktl kto ktt la- laa lab lac laf lak lal lao lat lba lbb lbc lbf lbk lbl lbo lbt lca lcb lcc lcf lck lcl lco lct lfa lfb lfc lff lfk lfl lfo lft lka lkb lkl lkt lla llb llc llf llk lll llo llt loa lob loc lof lok lol loo lot lta ltb ltc ltf ltk ltl lto ltt oaa oab oac oaf oak oal oao oat ob- oba obb obc obf obk obl obo obt oc- oca ocb occ ocf ock ocl oco oct of- ofa ofb ofc off ofl ofo oft oka okb okc okk okl oko ola olb olc olf olk oll olo olt oo- ooa oob ooc oof ook ool ooo oot ot- ota otb otc otf otk otl oto ott taa tab tac taf tak tal tao tat tba tbb tbc tbf tbk tbl tbo tbt tca tcb tcc tcf tck tcl tco tct tfa tfb tfc tff tfk tfl tfo tft tka tkb tkc tkk tkl tko tkt tla tlc tlf tlk tll tlo tlt to- toa tob toc tof tok tol too tot tta ttb ttc ttf ttk ttl tto ttt