a-a a-c aaa aac aak aao aas aau ac- aca acc ack aco acs acu aka akc akk ako aks aku aoa aoc aok aoo aos aou as- asa asc ask aso ass asu au- aua auc auk auo aus c-- caa cac cak cao cas cau cca ccc cck cco ccs ccu cka ckc cko cks co- coa coc cok coo cos cou csa csc csk cso css csu cua cuc cuk cuo cus cuu ka- kaa kac kak kao kas kau kca kcc kck kcs kcu kkc kkk kks kku koa koc kok koo kos kou ksa ksc ksk kso kss ksu kuc kuk kus kuu oaa oac oak oao oas oau oc- oca occ ock oco ocs ocu oka okc okk oko oks oku oo- ooa ooc ook ooo oos os- osa osc osk oso oss osu ou- oua ouc ouk ouo ous saa sac sak sao sas sau sca scc sck sco scs scu sk- ska skc skk sko sks sku soa soc sok soo sos sou ss- ssa ssc ssk sso sss ssu sua suc suk suo sus suu ua- uaa uac uak uao uas uau uca ucc uck uco ucs ucu uka ukc ukk uku uoa uoc uok uoo uos usa usc usk uso uss usu uua uuc uus uuu