a-a a-b a-c aaa aab aac aak aao aas aaw ab- aba abb abc abk abo abs abw ac- aca acb acc ack aco acs acw aka akb akc akk ako aks akw aoa aob aoc aok aoo aos aow as- asa asb asc ask aso ass asw aw- awa awb awc awk awo aws aww baa bab bac bak bao bas baw bba bbb bbc bbk bbo bbs bbw bca bcb bcc bck bco bcs bka bkb bkc bkk bko bks bkw boa bob boc bok boo bos bow bsa bsb bsc bsk bso bss bsw bwa bwb bwc bwk bwo bws c-- caa cab cac cak cao cas caw cba cbb cbc cbk cbo cbs cbw cca ccb ccc cck cco ccs ccw cka ckb ckc cko cks ckw co- coa cob coc cok coo cos cow csa csb csc csk cso css csw cw- cwa cwb cwc cwk cwo cws ka- kaa kab kac kak kao kas kaw kba kbb kbc kbk kbo kbs kbw kca kcb kcc kck kcs kkb kkc kkk kks koa kob koc kok koo kos kow ksa ksb ksc ksk kso kss ksw kw- kwa kwc kwk kwo kws kww oaa oab oac oak oao oas oaw ob- oba obb obc obk obo obs obw oc- oca ocb occ ock oco ocs ocw oka okb okc okk oko oks okw oo- ooa oob ooc ook ooo oos oow os- osa osb osc osk oso oss osw owa owb owc owk owo ows oww saa sab sac sak sao sas saw sba sbb sbc sbk sbo sbs sbw sca scb scc sck sco scs scw sk- ska skb skc skk sko sks skw soa sob soc sok soo sos sow ss- ssa ssb ssc ssk sso sss ssw swa swb swc swk swo sws waa wab wac wak wao was waw wba wbb wbc wbo wbs wbw wca wcb wcc wck wco wcs wcw wka wkb wkc wko wks wkw woa wob woc wok woo wos wow wsa wsb wsc wsk wso wss wsw wwa wwc wwo www