a-a a-b aaa aab aam aao aap aax ab- aba abb abm abo abp abx ama amb amm amo amp amx aoa aob aom aoo aop aox ap- apa apb apm apo app apx ax- axa axm axo axp axx b-p baa bab bam bao bap bax bba bbb bbm bbo bbp bbx bma bmb bmm bmo bmp bmx boa bob bom boo bop box bpa bpb bpm bpo bpp bpx bxb bxm bxo bxx m-o maa mab mam mao map max mba mbb mbm mbo mbp mbx mma mmb mmm mmo mmp mmx moa mob mom moo mop mox mpa mpb mpm mpo mpp mpx mxa mxp oaa oab oam oao oap oax ob- oba obb obm obo obp obx om- oma omb omm omo omp omx oo- ooa oob oom ooo oop oox op- opa opb opm opo opp opx ox- oxa oxb oxo oxx p-p paa pab pam pao pap pax pba pbb pbm pbo pbp pbx pma pmb pmm pmo pmp pmx poa pob pom poo pop pox ppa ppb ppm ppo ppp ppx pxm xaa xam xap xbx xma xmm xmo xmp xmx xoa xom xoo xop xox xpa xpb xpm xpo xpp xxo xxp xxx