-al -ol a-a a-b a-c a-t aaa aab aac aae aak aal aao aat aax ab- aba abb abc abe abk abl abo abt abx ac- aca acb acc ace ack acl aco act acx aea aeb aec aee aek ael aeo aet aex aka akb akc ake akk akl ako al- ala alb alc ale alk all alo alt alx aoa aob aoc aoe aok aol aoo aot aox at- ata atb atc ate atl ato att atx ax- axa axe axk axl axo axt axx baa bab bac bae bak bal bao bat bax bba bbb bbc bbe bbk bbl bbo bbt bbx bca bcb bcc bce bck bcl bco bct bcx be- bea beb bec bee bek bel beo bet bex bka bkb bkc bke bkk bkl bko bkt bkx bla blb blc ble blk bll blo blt blx boa bob boc boe bok bol boo bot box bta btb btc bte btk btl bto btt btx bxb bxl bxo bxx c-- caa cab cac cae cak cal cao cat cax cba cbb cbc cbe cbk cbl cbo cbt cbx cca ccb ccc cce cck ccl cco cct ccx ce- cea ceb cec cee cek cel ceo cet cex cka ckb ckc cko ckt ckx cl- cla clb clc cle clk cll clo clt clx co- coa cob coc coe cok col coo cot cox cta ctb ctc cte ctk ctl cto ctt ctx cxc cxk cxl cxo cxt cxx eaa eab eac eae eak eal eao eat eax eba ebb ebc ebe ebk ebl ebo ebt ebx ec- eca ecb ecc ece eck ecl eco ect ecx eea eeb eec eee eek eel eeo eet eex eka ekb ekc eke ekl eko ekt ela elb elc ele elk ell elo elt elx eo- eoa eob eoc eoe eok eol eoo eot eta etb etc ete etk etl eto ett etx ex- exa exc exe exl exo ext exx k-t ka- kaa kab kac kae kak kal kao kat kax kba kbb kbc kbe kbk kbl kbo kbx kca kcb kcc kce kck kcl kct kcx ke- kea keb kec kee kek kel keo ket kex kkb kkc kke kkk kkl kkt kl- kla klb klc klo klt klx koa kob koc koe kok kol koo kot kta ktb ktc kte ktk ktl kto ktt kxl kxo la- laa lab lac lae lak lal lao lat lax lba lbb lbc lbe lbk lbl lbo lbt lbx lca lcb lcc lce lck lcl lco lct lcx lea leb lec lee lek lel leo let lex lka lkb lkl lkt lla llb llc lle llk lll llo llt loa lob loc loe lok lol loo lot lox lta ltb ltc lte ltk ltl lto ltt ltx lxc lxo lxx oaa oab oac oae oak oal oao oat oax ob- oba obb obc obe obk obl obo obt obx oc- oca ocb occ ock ocl oco oct ocx oea oeb oec oee oel oeo oet oex oka okb okc oke okk okl oko ola olb olc ole olk oll olo olt oo- ooa oob ooc ook ool ooo oot oox ot- ota otb otc ote otk otl oto ott ox- oxa oxb oxc oxo oxt oxx t-x taa tab tac tae tak tal tao tat tax tba tbb tbc tbe tbk tbl tbo tbt tca tcb tcc tce tck tcl tco tct tcx te- tea teb tec tee tek tel teo tet tex tka tkb tkc tke tkk tkl tko tkt tla tlc tle tlk tll tlo tlt tlx to- toa tob toc toe tok tol too tot tox tta ttb ttc tte ttk ttl tto ttt ttx txe txk txl txt xaa xac xak xal xat xbc xbe xbl xbx xcb xcl xcx xee xel xet xex xkb xke xkl xla xlb xlt xoa xoc xok xoo xot xox xtc xtx xxl xxo xxx