a-a a-b a-c aaa aab aac aae aah aak aap ab- aba abb abc abe abh abk abp ac- aca acb acc ace ach ack acp aea aeb aec aee aeh aek aep aha ahb ahc ahe ahh ahk ahp aka akb akc ake akh akk akp ap- apa apb apc ape aph apk app b-p baa bab bac bae bah bak bap bba bbb bbc bbe bbh bbk bbp bca bcb bcc bce bch bck bcp be- bea beb bec bee beh bek bep bha bhb bhc bhe bhh bhk bhp bka bkb bkc bke bkk bkp bpa bpb bpc bpe bph bpp c-- caa cab cac cae cah cak cap cba cbb cbc cbe cbh cbk cbp cca ccb ccc cce cch cck ccp ce- cea ceb cec cee ceh cek cep ch- cha chb chc che chh chk chp cka ckb ckc ckh cpa cpb cpc cpe cph cpk cpp eaa eab eac eae eah eak eap eba ebb ebc ebe ebh ebk ebp ec- eca ecb ecc ece ech eck eea eeb eec eee eek eep eha ehb ehc ehe ehh ehp eka ekb ekc eke ekh ekp ep- epa epb epc epe eph epp haa hab hac hae hah hak hap hba hbb hbc hbe hbh hbk hbp hca hcb hcc hce hch hck hcp he- hea heb hec hee heh hek hep hha hhb hhc hhe hhh hhk hhp hka hkb hkh hkk hkp hpa hpb hpc hpe hph hpk hpp ka- kaa kab kac kae kah kak kap kba kbb kbc kbe kbh kbk kbp kca kcb kcc kce kch kck kcp ke- kea keb kec kee keh kek kep kha khe khh khk kkb kkc kke kkh kkk kkp kpa kpc kpe kph kpk kpp p-p paa pab pac pae pah pak pap pba pbb pbc pbe pbk pbp pca pcb pcc pce pch pck pcp pea peb pec pee peh pek pep pha phb phc phe phk php pka pkb pkc pke pkp ppa ppb ppc ppe pph ppk ppp