a-a a-b aaa aab aam aan aao aap ab- aba abb abm abn abo abp ama amb amm amn amo amp an- ana anb anm ann ano anp aoa aob aom aon aoo aop ap- apa apb apm apn apo app b-p baa bab bam ban bao bap bba bbb bbm bbn bbo bbp bma bmb bmm bmn bmo bmp bna bnb bnn bno bnp boa bob bom bon boo bop bpa bpb bpm bpn bpo bpp m-o maa mab mam man mao map mba mbb mbm mbo mbp mma mmb mmm mmn mmo mmp mna mnb mnm mnn mno mnp moa mob mom mon moo mop mpa mpb mpm mpn mpo mpp naa nab nam nan nao nap nba nbb nbm nbn nbo nbp nma nmb nmm nmn nmo nmp nna nnb nnm nnn nno nnp no- noa nob nom non noo nop npa npb npm npn npo npp oaa oab oam oan oao oap ob- oba obb obm obn obo obp om- oma omb omm omn omo omp on- ona onb onn ono onp oo- ooa oob oom oon ooo oop op- opa opb opm opn opo opp p-p paa pab pam pan pao pap pba pbb pbm pbn pbo pbp pma pmb pmm pmn pmo pmp pn- pna pnb pnm pnn pno pnp poa pob pom pon poo pop ppa ppb ppm ppn ppo ppp