a-a a-b aaa aab aak aam aan aao aap ab- aba abb abk abm abn abo abp aka akb akk akm akn ako akp ama amb amk amm amn amo amp an- ana anb ank anm ann ano anp aoa aob aok aom aon aoo aop ap- apa apb apk apm apn apo app b-p baa bab bak bam ban bao bap bba bbb bbk bbm bbn bbo bbp bka bkb bkk bkm bkn bko bkp bma bmb bmk bmm bmn bmo bmp bna bnb bnk bnn bno bnp boa bob bok bom bon boo bop bpa bpb bpm bpn bpo bpp ka- kaa kab kak kam kan kao kap kba kbb kbk kbm kbn kbo kbp kkb kkk kkm kkn kkp kma kmb kmk kmm kmo kmp kn- kna knk knm knn kno knp koa kob kok kom kon koo kop kpa kpk kpm kpn kpo kpp m-o maa mab mak mam man mao map mba mbb mbk mbm mbo mbp mka mkb mkk mkm mkn mko mkp mma mmb mmk mmm mmn mmo mmp mna mnb mnk mnm mnn mno mnp moa mob mok mom mon moo mop mpa mpb mpk mpm mpn mpo mpp naa nab nak nam nan nao nap nba nbb nbk nbm nbn nbo nbp nka nkk nkm nkn nko nkp nma nmb nmk nmm nmn nmo nmp nna nnb nnk nnm nnn nno nnp no- noa nob nok nom non noo nop npa npb npm npn npo npp oaa oab oak oam oan oao oap ob- oba obb obk obm obn obo obp oka okb okk oko okp om- oma omb omm omn omo omp on- ona onb onk onn ono onp oo- ooa oob ook oom oon ooo oop op- opa opb opk opm opn opo opp p-p paa pab pak pam pan pao pap pba pbb pbk pbm pbn pbo pbp pka pkb pkm pkn pko pkp pma pmb pmk pmm pmn pmo pmp pn- pna pnb pnk pnm pnn pno pnp poa pob pok pom pon poo pop ppa ppb ppk ppm ppn ppo ppp