a-a a-b aaa aab aak aam aap ab- aba abb abk abm abp aka akb akk akm akp ama amb amk amm amp ap- apa apb apk apm app b-p baa bab bak bam bap bba bbb bbk bbm bbp bka bkb bkk bkm bkp bma bmb bmk bmm bmp bpa bpb bpm bpp ka- kaa kab kak kam kap kba kbb kbk kbm kbp kkb kkk kkm kkp kma kmb kmk kmm kmp kpa kpk kpm kpp maa mab mak mam map mba mbb mbk mbm mbp mka mkb mkk mkm mkp mma mmb mmk mmm mmp mpa mpb mpk mpm mpp p-p paa pab pak pam pap pba pbb pbk pbm pbp pka pkb pkm pkp pma pmb pmk pmm pmp ppa ppb ppk ppm ppp