a-a a-b aaa aab aae aah aan aap ab- aba abb abe abh abn abp aea aeb aee aeh aen aep aha ahb ahe ahh ahn ahp an- ana anb ane anh ann anp ap- apa apb ape aph apn app b-p baa bab bae bah ban bap bba bbb bbe bbh bbn bbp be- bea beb bee beh ben bep bha bhb bhe bhh bhp bna bnb bne bnn bnp bpa bpb bpe bph bpn bpp eaa eab eae eah ean eap eba ebb ebe ebh ebn ebp eea eeb eee een eep eha ehb ehe ehh ehn ehp en- ena enb ene enh enn enp ep- epa epb epe eph epn epp haa hab hae hah han hap hba hbb hbe hbh hbn hbp he- hea heb hee heh hen hep hha hhb hhe hhh hhn hhp hna hnb hne hnh hnn hpa hpb hpe hph hpn hpp naa nab nae nah nan nap nba nbb nbe nbn nbp ne- nea neb nee neh nen nep nha nhb nhe nhh nhn nhp nna nnb nne nnh nnn nnp npa npb npe nph npn npp p-p paa pab pae pah pan pap pba pbb pbe pbn pbp pea peb pee peh pen pep pha phb phe phn php pn- pna pnb pne pnh pnn pnp ppa ppb ppe pph ppn ppp