-al -ol a-a a-b a-t aaa aab aak aal aao aat aax ab- aba abb abk abl abo abt abx aka akb akk akl ako al- ala alb alk all alo alt alx aoa aob aok aol aoo aot aox at- ata atb atl ato att atx ax- axa axk axl axo axt axx baa bab bak bal bao bat bax bba bbb bbk bbl bbo bbt bbx bka bkb bkk bkl bko bkt bkx bla blb blk bll blo blt blx boa bob bok bol boo bot box bta btb btk btl bto btt btx bxb bxl bxo bxx k-t ka- kaa kab kak kal kao kat kax kba kbb kbk kbl kbo kbx kkb kkk kkl kkt kl- kla klb klo klt klx koa kob kok kol koo kot kta ktb ktk ktl kto ktt kxl kxo la- laa lab lak lal lao lat lax lba lbb lbk lbl lbo lbt lbx lka lkb lkl lkt lla llb llk lll llo llt loa lob lok lol loo lot lox lta ltb ltk ltl lto ltt ltx lxo lxx oaa oab oak oal oao oat oax ob- oba obb obk obl obo obt obx oka okb okk okl oko ola olb olk oll olo olt oo- ooa oob ook ool ooo oot oox ot- ota otb otk otl oto ott ox- oxa oxb oxo oxt oxx t-x taa tab tak tal tao tat tax tba tbb tbk tbl tbo tbt tka tkb tkk tkl tko tkt tla tlk tll tlo tlt tlx to- toa tob tok tol too tot tox tta ttb ttk ttl tto ttt ttx txk txl txt xaa xak xal xat xbl xbx xkb xkl xla xlb xlt xoa xok xoo xot xox xtx xxl xxo xxx