a-a a-b a-c aaa aab aac aah aak aao aap ab- aba abb abc abh abk abo abp ac- aca acb acc ach ack aco acp aha ahb ahc ahh ahk aho ahp aka akb akc akh akk ako akp aoa aob aoc aoh aok aoo aop ap- apa apb apc aph apk apo app b-p baa bab bac bah bak bao bap bba bbb bbc bbh bbk bbo bbp bca bcb bcc bch bck bco bcp bha bhb bhc bhh bhk bho bhp bka bkb bkc bkk bko bkp boa bob boc boh bok boo bop bpa bpb bpc bph bpo bpp c-- caa cab cac cah cak cao cap cba cbb cbc cbh cbk cbo cbp cca ccb ccc cch cck cco ccp ch- cha chb chc chh chk cho chp cka ckb ckc ckh cko co- coa cob coc coh cok coo cop cpa cpb cpc cph cpk cpo cpp haa hab hac hah hak hao hap hba hbb hbc hbh hbk hbo hbp hca hcb hcc hch hck hco hcp hha hhb hhc hhh hhk hho hhp hka hkb hkh hkk hko hkp hoa hob hoc hoh hok hoo hop hpa hpb hpc hph hpk hpo hpp ka- kaa kab kac kah kak kao kap kba kbb kbc kbh kbk kbo kbp kca kcb kcc kch kck kcp kha khh khk kho kkb kkc kkh kkk kkp koa kob koc koh kok koo kop kpa kpc kph kpk kpo kpp oaa oab oac oah oak oao oap ob- oba obb obc obh obk obo obp oc- oca ocb occ och ock oco ocp oha ohc ohh oho ohp oka okb okc okk oko okp oo- ooa oob ooc ooh ook ooo oop op- opa opb opc oph opk opo opp p-p paa pab pac pah pak pao pap pba pbb pbc pbk pbo pbp pca pcb pcc pch pck pco pcp pha phb phc phk pho php pka pkb pkc pko pkp poa pob poc poh pok poo pop ppa ppb ppc pph ppk ppo ppp