a-a a-b a-c aaa aab aac aae aag aak aap ab- aba abb abc abe abg abk abp ac- aca acb acc ace acg ack acp aea aeb aec aee aeg aek aep ag- aga agb agc age agg agk agp aka akb akc ake akg akk akp ap- apa apb apc ape apg apk app b-p baa bab bac bae bag bak bap bba bbb bbc bbe bbg bbk bbp bca bcb bcc bce bcg bck bcp be- bea beb bec bee beg bek bep bga bgb bgc bge bgg bgk bgp bka bkb bkc bke bkg bkk bkp bpa bpb bpc bpe bpg bpp c-- caa cab cac cae cag cak cap cba cbb cbc cbe cbg cbk cbp cca ccb ccc cce ccg cck ccp ce- cea ceb cec cee ceg cek cep cga cgb cgc cge cgg cgp cka ckb ckc cpa cpb cpc cpe cpg cpk cpp eaa eab eac eae eag eak eap eba ebb ebc ebe ebg ebk ebp ec- eca ecb ecc ece ecg eck eea eeb eec eee eeg eek eep ega egb egc ege egg egp eka ekb ekc eke ekg ekp ep- epa epb epc epe epg epp g-p gaa gab gac gae gag gak gap gba gbc gbe gbg gbk gbp gca gcb gcc gce gcg gck gcp ge- gea geb gec gee geg gek gep gga ggb ggc ggg ggp gka gkb gkp gpa gpb gpc gpe gpg gpk gpp ka- kaa kab kac kae kag kak kap kba kbb kbc kbe kbk kbp kca kcb kcc kce kcg kck kcp ke- kea keb kec kee keg kek kep kga kgb kgc kgp kkb kkc kke kkk kkp kpa kpc kpe kpk kpp p-p paa pab pac pae pag pak pap pba pbb pbc pbe pbg pbk pbp pca pcb pcc pce pcg pck pcp pea peb pec pee peg pek pep pga pgb pgc pge pgg pgk pgp pka pkb pkc pke pkg pkp ppa ppb ppc ppe ppg ppk ppp