a-a a-b aaa aab aam aan aap ab- aba abb abm abn abp ama amb amm amn amp an- ana anb anm ann anp ap- apa apb apm apn app b-p baa bab bam ban bap bba bbb bbm bbn bbp bma bmb bmm bmn bmp bna bnb bnn bnp bpa bpb bpm bpn bpp maa mab mam man map mba mbb mbm mbp mma mmb mmm mmn mmp mna mnb mnm mnn mnp mpa mpb mpm mpn mpp naa nab nam nan nap nba nbb nbm nbn nbp nma nmb nmm nmn nmp nna nnb nnm nnn nnp npa npb npm npn npp p-p paa pab pam pan pap pba pbb pbm pbn pbp pma pmb pmm pmn pmp pn- pna pnb pnm pnn pnp ppa ppb ppm ppn ppp