a-a a-b a-t aaa aab aae aak aao aat aau aax ab- aba abb abe abk abo abt abu abx aea aeb aee aek aeo aet aeu aex aka akb ake akk ako aku aoa aob aoe aok aoo aot aou aox at- ata atb ate ato att atu atx au- aua aub aue auk auo aut aux ax- axa axe axk axo axt axx b-u baa bab bae bak bao bat bau bax bba bbb bbe bbk bbo bbt bbu bbx be- bea beb bee bek beo bet beu bex bka bkb bke bkk bko bkt bkx boa bob boe bok boo bot bou box bta btb bte btk bto btt btu btx bua bub bue buk buo but buu bux bxb bxo bxx eaa eab eae eak eao eat eau eax eba ebb ebe ebk ebo ebt ebu ebx eea eeb eee eek eeo eet eex eka ekb eke eko ekt eku eo- eoa eob eoe eok eoo eot eou eta etb ete etk eto ett etu etx eu- eua eub eue eut eux ex- exa exe exo ext exu exx k-t ka- kaa kab kae kak kao kat kau kax kba kbb kbe kbk kbo kbu kbx ke- kea keb kee kek keo ket kex kkb kke kkk kkt kku koa kob koe kok koo kot kou kta ktb kte ktk kto ktt ktu kub kue kuk kut kuu kxo oaa oab oae oak oao oat oau oax ob- oba obb obe obk obo obt obu obx oea oeb oee oeo oet oex oka okb oke okk oko oku oo- ooa oob ook ooo oot oox ot- ota otb ote otk oto ott otu ou- oua oue ouk ouo out ox- oxa oxb oxo oxt oxx t-x taa tab tae tak tao tat tau tax tba tbb tbe tbk tbo tbt tbu te- tea teb tee tek teo tet teu tex tka tkb tke tkk tko tkt to- toa tob toe tok too tot tou tox tta ttb tte ttk tto ttt ttu ttx tua tub tue tuk tuo tut tuu tux txe txk txt txu ua- uaa uab uae uak uao uat uau uba ubb ube ubk ubo ubt ubu ubx uea ueb uee uet uka ukb uke ukk uku uoa uob uoe uok uoo uot uox uta utb ute utk uto utt utu utx uua uue uut uuu uxb uxo uxt uxu xaa xak xat xau xbe xbx xee xet xeu xex xkb xke xoa xok xoo xot xox xtx xue xxo xxx