a-a a-b a-c aaa aab aac aae aak aap ab- aba abb abc abe abk abp ac- aca acb acc ace ack acp aea aeb aec aee aek aep aka akb akc ake akk akp ap- apa apb apc ape apk app b-p baa bab bac bae bak bap bba bbb bbc bbe bbk bbp bca bcb bcc bce bck bcp be- bea beb bec bee bek bep bka bkb bkc bke bkk bkp bpa bpb bpc bpe bpp c-- caa cab cac cae cak cap cba cbb cbc cbe cbk cbp cca ccb ccc cce cck ccp ce- cea ceb cec cee cek cep cka ckb ckc cpa cpb cpc cpe cpk cpp eaa eab eac eae eak eap eba ebb ebc ebe ebk ebp ec- eca ecb ecc ece eck eea eeb eec eee eek eep eka ekb ekc eke ekp ep- epa epb epc epe epp ka- kaa kab kac kae kak kap kba kbb kbc kbe kbk kbp kca kcb kcc kce kck kcp ke- kea keb kec kee kek kep kkb kkc kke kkk kkp kpa kpc kpe kpk kpp p-p paa pab pac pae pak pap pba pbb pbc pbe pbk pbp pca pcb pcc pce pck pcp pea peb pec pee pek pep pka pkb pkc pke pkp ppa ppb ppc ppe ppk ppp