a-a a-c aaa aac aaf aam aan aao aap ac- aca acc acf acm acn aco acp af- afa afc aff afm afn afo afp ama amc amf amm amn amo amp an- ana anc anf anm ann ano anp aoa aoc aof aom aon aoo aop ap- apa apc apf apm apn apo app c-- caa cac caf cam can cao cap cca ccc ccf ccm ccn cco ccp cfa cfc cff cfm cfn cfo cfp cma cmc cmf cmm cmn cmo cmp cn- cna cnc cnf cnm cnn cno cnp co- coa coc cof com con coo cop cpa cpc cpf cpm cpn cpo cpp faa fac faf fam fan fao fap fca fcc fcf fcm fcn fco fcp ffa ffc fff ffm ffn ffo ffp fma fmc fmf fmm fmn fmo fmp fna fnc fnf fnm fnn fnp foa foc fof fom fon foo fop fpa fpc fpm fpn fpo fpp m-f m-o maa mac maf mam man mao map mc- mca mcc mcf mcm mcn mco mcp mfa mfc mff mfm mfn mfo mfp mma mmc mmf mmm mmn mmo mmp mna mnc mnf mnm mnn mno mnp moa moc mof mom mon moo mop mpa mpc mpf mpm mpn mpo mpp naa nac naf nam nan nao nap nca ncc ncf ncm ncn nco ncp nfa nfc nff nfn nfo nfp nma nmc nmm nmn nmo nmp nna nnc nnf nnm nnn nno nnp no- noa noc nof nom non noo nop npa npc npf npm npn npo npp oaa oac oaf oam oan oao oap oc- oca occ ocf ocm ocn oco ocp of- ofa ofc off ofm ofn ofo ofp om- oma omc omf omm omn omo omp on- ona onc onf onn ono onp oo- ooa ooc oof oom oon ooo oop op- opa opc opf opm opn opo opp p-p paa pac paf pam pan pao pap pca pcc pcf pcm pcn pco pcp pfa pfc pff pfm pfn pfo pfp pma pmc pmf pmm pmn pmo pmp pn- pna pnc pnf pnm pnn pno pnp poa poc pof pom pon poo pop ppa ppc ppf ppm ppn ppo ppp