a-a a-b a-c aaa aab aac aae aah aan aap ab- aba abb abc abe abh abn abp ac- aca acb acc ace ach acn acp aea aeb aec aee aeh aen aep aha ahb ahc ahe ahh ahn ahp an- ana anb anc ane anh ann anp ap- apa apb apc ape aph apn app b-p baa bab bac bae bah ban bap bba bbb bbc bbe bbh bbn bbp bca bcb bcc bce bch bcn bcp be- bea beb bec bee beh ben bep bha bhb bhc bhe bhh bhp bna bnb bnc bne bnn bnp bpa bpb bpc bpe bph bpn bpp c-- caa cab cac cae cah can cap cba cbb cbc cbe cbh cbn cbp cca ccb ccc cce cch ccn ccp ce- cea ceb cec cee ceh cen cep ch- cha chb chc che chh chn chp cn- cna cnb cnc cne cnh cnn cnp cpa cpb cpc cpe cph cpn cpp eaa eab eac eae eah ean eap eba ebb ebc ebe ebh ebn ebp ec- eca ecb ecc ece ech ecn eea eeb eec eee een eep eha ehb ehc ehe ehh ehn ehp en- ena enb enc ene enh enn enp ep- epa epb epc epe eph epn epp haa hab hac hae hah han hap hba hbb hbc hbe hbh hbn hbp hca hcb hcc hce hch hcn hcp he- hea heb hec hee heh hen hep hha hhb hhc hhe hhh hhn hhp hna hnb hnc hne hnh hnn hpa hpb hpc hpe hph hpn hpp naa nab nac nae nah nan nap nba nbb nbc nbe nbn nbp nca ncb ncc nce nch ncn ncp ne- nea neb nec nee neh nen nep nha nhb nhc nhe nhh nhn nhp nna nnb nnc nne nnh nnn nnp npa npb npc npe nph npn npp p-p paa pab pac pae pah pan pap pba pbb pbc pbe pbn pbp pca pcb pcc pce pch pcn pcp pea peb pec pee peh pen pep pha phb phc phe phn php pn- pna pnb pnc pne pnh pnn pnp ppa ppb ppc ppe pph ppn ppp