a-a a-b aaa aab aak aam aao aap aar ab- aba abb abk abm abo abp abr aka akb akk akm ako akp akr ama amb amk amm amo amp amr aoa aob aok aom aoo aop aor ap- apa apb apk apm apo app apr ar- ara arb ark arm aro arp arr b-p baa bab bak bam bao bap bar bba bbb bbk bbm bbo bbp bbr bka bkb bkk bkm bko bkp bkr bma bmb bmk bmm bmo bmp bmr boa bob bok bom boo bop bor bpa bpb bpm bpo bpp bpr bra brb brk brm bro brp brr ka- kaa kab kak kam kao kap kar kba kbb kbk kbm kbo kbp kbr kkb kkk kkm kkp kkr kma kmb kmk kmm kmo kmp koa kob kok kom koo kop kor kpa kpk kpm kpo kpp kpr kra krk kro krp krr m-o m-r maa mab mak mam mao map mar mba mbb mbk mbm mbo mbp mbr mka mkb mkk mkm mko mkp mkr mma mmb mmk mmm mmo mmp mmr moa mob mok mom moo mop mor mpa mpb mpk mpm mpo mpp mpr mra mrb mrk mrm mro mrp mrr oaa oab oak oam oao oap oar ob- oba obb obk obm obo obp obr oka okb okk oko okp okr om- oma omb omm omo omp omr oo- ooa oob ook oom ooo oop oor op- opa opb opk opm opo opp opr or- ora orb ork orm oro orp orr p-p paa pab pak pam pao pap par pba pbb pbk pbm pbo pbp pbr pka pkb pkm pko pkp pkr pma pmb pmk pmm pmo pmp pmr poa pob pok pom poo pop por ppa ppb ppk ppm ppo ppp ppr pra prb prk prm pro prp prr ra- raa rab rak ram rao rap rar rba rbb rbk rbm rbo rbp rbr rkb rkk rkm rko rkp rma rmb rmm rmo rmp rmr roa rob rok rom roo rop ror rpa rpb rpk rpm rpo rpp rpr rra rrb rrk rrm rrp rrr