a-a a-b aaa aab aak aam aap aar ab- aba abb abk abm abp abr aka akb akk akm akp akr ama amb amk amm amp amr ap- apa apb apk apm app apr ar- ara arb ark arm arp arr b-p baa bab bak bam bap bar bba bbb bbk bbm bbp bbr bka bkb bkk bkm bkp bkr bma bmb bmk bmm bmp bmr bpa bpb bpm bpp bpr bra brb brk brm brp brr ka- kaa kab kak kam kap kar kba kbb kbk kbm kbp kbr kkb kkk kkm kkp kkr kma kmb kmk kmm kmp kpa kpk kpm kpp kpr kra krk krp krr m-r maa mab mak mam map mar mba mbb mbk mbm mbp mbr mka mkb mkk mkm mkp mkr mma mmb mmk mmm mmp mmr mpa mpb mpk mpm mpp mpr mra mrb mrk mrm mrp mrr p-p paa pab pak pam pap par pba pbb pbk pbm pbp pbr pka pkb pkm pkp pkr pma pmb pmk pmm pmp pmr ppa ppb ppk ppm ppp ppr pra prb prk prm prp prr ra- raa rab rak ram rap rar rba rbb rbk rbm rbp rbr rkb rkk rkm rkp rma rmb rmm rmp rmr rpa rpb rpk rpm rpp rpr rra rrb rrk rrm rrp rrr