a-a a-b aaa aab aae aam aan aap ab- aba abb abe abm abn abp aea aeb aee aem aen aep ama amb ame amm amn amp an- ana anb ane anm ann anp ap- apa apb ape apm apn app b-p baa bab bae bam ban bap bba bbb bbe bbm bbn bbp be- bea beb bee bem ben bep bma bmb bme bmm bmn bmp bna bnb bne bnn bnp bpa bpb bpe bpm bpn bpp eaa eab eae eam ean eap eba ebb ebe ebm ebn ebp eea eeb eee eem een eep em- ema emb eme emm emn emp en- ena enb ene enm enn enp ep- epa epb epe epm epn epp maa mab mae mam man map mba mbb mbe mbm mbp mea meb mee mem men mep mma mmb mme mmm mmn mmp mna mnb mne mnm mnn mnp mpa mpb mpe mpm mpn mpp naa nab nae nam nan nap nba nbb nbe nbm nbn nbp ne- nea neb nee nem nen nep nma nmb nme nmm nmn nmp nna nnb nne nnm nnn nnp npa npb npe npm npn npp p-p paa pab pae pam pan pap pba pbb pbe pbm pbn pbp pea peb pee pem pen pep pma pmb pme pmm pmn pmp pn- pna pnb pne pnm pnn pnp ppa ppb ppe ppm ppn ppp