a-a a-b a-c aaa aab aac aak aao aap aaw ab- aba abb abc abk abo abp abw ac- aca acb acc ack aco acp acw aka akb akc akk ako akp akw aoa aob aoc aok aoo aop aow ap- apa apb apc apk apo app apw aw- awa awb awc awk awo awp aww b-p baa bab bac bak bao bap baw bba bbb bbc bbk bbo bbp bbw bca bcb bcc bck bco bcp bka bkb bkc bkk bko bkp bkw boa bob boc bok boo bop bow bpa bpb bpc bpo bpp bpw bwa bwb bwc bwk bwo bwp c-- caa cab cac cak cao cap caw cba cbb cbc cbk cbo cbp cbw cca ccb ccc cck cco ccp ccw cka ckb ckc cko ckw co- coa cob coc cok coo cop cow cpa cpb cpc cpk cpo cpp cpw cw- cwa cwb cwc cwk cwo cwp ka- kaa kab kac kak kao kap kaw kba kbb kbc kbk kbo kbp kbw kca kcb kcc kck kcp kkb kkc kkk kkp koa kob koc kok koo kop kow kpa kpc kpk kpo kpp kpw kw- kwa kwc kwk kwo kwp kww oaa oab oac oak oao oap oaw ob- oba obb obc obk obo obp obw oc- oca ocb occ ock oco ocp ocw oka okb okc okk oko okp okw oo- ooa oob ooc ook ooo oop oow op- opa opb opc opk opo opp opw owa owb owc owk owo owp oww p-p paa pab pac pak pao pap paw pba pbb pbc pbk pbo pbp pbw pca pcb pcc pck pco pcp pcw pka pkb pkc pko pkp poa pob poc pok poo pop pow ppa ppb ppc ppk ppo ppp ppw pwa pwb pwc pwo pwp waa wab wac wak wao wap waw wba wbb wbc wbo wbw wca wcb wcc wck wco wcp wcw wka wkb wkc wko wkp wkw woa wob woc wok woo wop wow wpa wpb wpc wpk wpo wpp wwa wwc wwo wwp www