a-a a-b aaa aab aak aam aao aap ab- aba abb abk abm abo abp aka akb akk akm ako akp ama amb amk amm amo amp aoa aob aok aom aoo aop ap- apa apb apk apm apo app b-p baa bab bak bam bao bap bba bbb bbk bbm bbo bbp bka bkb bkk bkm bko bkp bma bmb bmk bmm bmo bmp boa bob bok bom boo bop bpa bpb bpm bpo bpp ka- kaa kab kak kam kao kap kba kbb kbk kbm kbo kbp kkb kkk kkm kkp kma kmb kmk kmm kmo kmp koa kob kok kom koo kop kpa kpk kpm kpo kpp m-o maa mab mak mam mao map mba mbb mbk mbm mbo mbp mka mkb mkk mkm mko mkp mma mmb mmk mmm mmo mmp moa mob mok mom moo mop mpa mpb mpk mpm mpo mpp oaa oab oak oam oao oap ob- oba obb obk obm obo obp oka okb okk oko okp om- oma omb omm omo omp oo- ooa oob ook oom ooo oop op- opa opb opk opm opo opp p-p paa pab pak pam pao pap pba pbb pbk pbm pbo pbp pka pkb pkm pko pkp pma pmb pmk pmm pmo pmp poa pob pok pom poo pop ppa ppb ppk ppm ppo ppp