a-a a-c aaa aac aaf aaj aak aao aas ac- aca acc acf acj ack aco acs af- afa afc aff afj afk afo afs aja ajc ajf ajj ajk ajo ajs aka akc akj akk ako aks aoa aoc aof aoj aok aoo aos as- asa asc asf asj ask aso ass c-- c-j caa cac caf caj cak cao cas cca ccc ccf ccj cck cco ccs cfa cfc cff cfk cfo cfs cja cjc cjf cjk cjs cka ckc cko cks co- coa coc cof coj cok coo cos csa csc csf csj csk cso css faa fac faf faj fak fao fas fca fcc fcf fcj fck fco fcs ffa ffc fff ffk ffo ffs fja fjc fjs fka fkc fkf fkj fkk foa foc fof fok foo fos fsa fsc fsf fsj fsk fso fss jaa jac jaf jaj jak jao jas jca jcc jcf jck jco jcs jfa jfc jff jfj jfk jfo jfs jja jjc jjf jjj jjk jjs jka jkk jko jks joa joc jof joj jok joo jos jsa jsc jsf jsj jsk jso jss ka- kaa kac kaf kaj kak kao kas kca kcc kck kcs kfa kfc kff kfo kfs kjc kjs kkc kkk kks koa koc kof kok koo kos ksa ksc ksf ksk kso kss oaa oac oaf oaj oak oao oas oc- oca occ ocf ocj ock oco ocs of- ofa ofc off ofo ofs oja ojc ojo ojs oka okc okj okk oko oks oo- ooa ooc oof ook ooo oos os- osa osc osf osj osk oso oss saa sac saf saj sak sao sas sca scc scf scj sck sco scs sfa sfc sff sfj sfk sfo sfs sja sjc sjf sjj sjk sjs sk- ska skc skf skj skk sko sks soa soc sof soj sok soo sos ss- ssa ssc ssf ssj ssk sso sss