a-a a-b aaa aab aak aam aao aap aas ab- aba abb abk abm abo abp abs aka akb akk akm ako akp aks ama amb amk amm amo amp ams aoa aob aok aom aoo aop aos ap- apa apb apk apm apo app aps as- asa asb ask asm aso asp ass b-p baa bab bak bam bao bap bas bba bbb bbk bbm bbo bbp bbs bka bkb bkk bkm bko bkp bks bma bmb bmk bmm bmo bmp bms boa bob bok bom boo bop bos bpa bpb bpm bpo bpp bps bsa bsb bsk bsm bso bsp bss ka- kaa kab kak kam kao kap kas kba kbb kbk kbm kbo kbp kbs kkb kkk kkm kkp kks kma kmb kmk kmm kmo kmp kms koa kob kok kom koo kop kos kpa kpk kpm kpo kpp kps ksa ksb ksk ksm kso ksp kss m-o maa mab mak mam mao map mas mba mbb mbk mbm mbo mbp mbs mka mkb mkk mkm mko mkp mks mma mmb mmk mmm mmo mmp mms moa mob mok mom moo mop mos mpa mpb mpk mpm mpo mpp mps msa msb msk msm mso msp mss oaa oab oak oam oao oap oas ob- oba obb obk obm obo obp obs oka okb okk oko okp oks om- oma omb omm omo omp oms oo- ooa oob ook oom ooo oop oos op- opa opb opk opm opo opp ops os- osa osb osk osm oso osp oss p-p paa pab pak pam pao pap pas pba pbb pbk pbm pbo pbp pbs pka pkb pkm pko pkp pks pma pmb pmk pmm pmo pmp pms poa pob pok pom poo pop pos ppa ppb ppk ppm ppo ppp pps ps- psa psb psk psm pso psp pss saa sab sak sam sao sap sas sba sbb sbk sbm sbo sbp sbs sk- ska skb skk skm sko skp sks sma smb smk smm smo smp sms soa sob sok som soo sop sos spa spb spk spm spo spp sps ss- ssa ssb ssk ssm sso ssp sss