a-a a-b a-c aaa aab aac aae aaf aah aan aap ab- aba abb abc abe abf abh abn abp ac- aca acb acc ace acf ach acn acp aea aeb aec aee aef aeh aen aep af- afa afb afc afe aff afh afn afp aha ahb ahc ahe ahf ahh ahn ahp an- ana anb anc ane anf anh ann anp ap- apa apb apc ape apf aph apn app b-p baa bab bac bae baf bah ban bap bba bbb bbc bbe bbf bbh bbn bbp bca bcb bcc bce bcf bch bcn bcp be- bea beb bec bee bef beh ben bep bfa bfb bfc bfe bff bfh bfn bfp bha bhb bhc bhe bhf bhh bhp bna bnb bnc bne bnf bnn bnp bpa bpb bpc bpe bpf bph bpn bpp c-- caa cab cac cae caf cah can cap cba cbb cbc cbe cbf cbh cbn cbp cca ccb ccc cce ccf cch ccn ccp ce- cea ceb cec cee cef ceh cen cep cfa cfb cfc cfe cff cfh cfn cfp ch- cha chb chc che chf chh chn chp cn- cna cnb cnc cne cnf cnh cnn cnp cpa cpb cpc cpe cpf cph cpn cpp eaa eab eac eae eaf eah ean eap eba ebb ebc ebe ebf ebh ebn ebp ec- eca ecb ecc ece ecf ech ecn eea eeb eec eee eef een eep ef- efa efb efc efe eff efh efp eha ehb ehc ehe ehf ehh ehn ehp en- ena enb enc ene enf enh enn enp ep- epa epb epc epe epf eph epn epp faa fab fac fae faf fah fan fap fba fbb fbc fbe fbf fbh fbn fbp fca fcb fcc fce fcf fcn fcp fea feb fec fee fef feh fen fep ffa ffc ffe fff ffh ffn ffp fha fhb fhc fhe fhf fhh fhn fhp fna fnb fnc fne fnf fnh fnn fnp fpa fpb fpc fpe fph fpn fpp haa hab hac hae haf hah han hap hba hbb hbc hbe hbf hbh hbn hbp hca hcb hcc hce hcf hch hcn hcp he- hea heb hec hee hef heh hen hep hfa hfb hfc hfe hff hfh hfn hfp hha hhb hhc hhe hhf hhh hhn hhp hna hnb hnc hne hnf hnh hnn hpa hpb hpc hpe hpf hph hpn hpp naa nab nac nae naf nah nan nap nba nbb nbc nbe nbf nbn nbp nca ncb ncc nce ncf nch ncn ncp ne- nea neb nec nee nef neh nen nep nfa nfb nfc nfe nff nfn nfp nha nhb nhc nhe nhf nhh nhn nhp nna nnb nnc nne nnf nnh nnn nnp npa npb npc npe npf nph npn npp p-p paa pab pac pae paf pah pan pap pba pbb pbc pbe pbf pbn pbp pca pcb pcc pce pcf pch pcn pcp pea peb pec pee pef peh pen pep pfa pfb pfc pfe pff pfn pfp pha phb phc phe phf phn php pn- pna pnb pnc pne pnf pnh pnn pnp ppa ppb ppc ppe ppf pph ppn ppp