a-a a-b a-c aaa aab aac aam aao aap aas ab- aba abb abc abm abo abp abs ac- aca acb acc acm aco acp acs ama amb amc amm amo amp ams aoa aob aoc aom aoo aop aos ap- apa apb apc apm apo app aps as- asa asb asc asm aso asp ass b-p baa bab bac bam bao bap bas bba bbb bbc bbm bbo bbp bbs bca bcb bcc bcm bco bcp bcs bma bmb bmc bmm bmo bmp bms boa bob boc bom boo bop bos bpa bpb bpc bpm bpo bpp bps bsa bsb bsc bsm bso bsp bss c-- caa cab cac cam cao cap cas cba cbb cbc cbm cbo cbp cbs cca ccb ccc ccm cco ccp ccs cma cmb cmc cmm cmo cmp cms co- coa cob coc com coo cop cos cpa cpb cpc cpm cpo cpp cps csa csb csc csm cso csp css m-o maa mab mac mam mao map mas mba mbb mbc mbm mbo mbp mbs mc- mca mcb mcc mcm mco mcp mcs mma mmb mmc mmm mmo mmp mms moa mob moc mom moo mop mos mpa mpb mpc mpm mpo mpp mps msa msb msc msm mso msp mss oaa oab oac oam oao oap oas ob- oba obb obc obm obo obp obs oc- oca ocb occ ocm oco ocp ocs om- oma omb omc omm omo omp oms oo- ooa oob ooc oom ooo oop oos op- opa opb opc opm opo opp ops os- osa osb osc osm oso osp oss p-p paa pab pac pam pao pap pas pba pbb pbc pbm pbo pbp pbs pca pcb pcc pcm pco pcp pcs pma pmb pmc pmm pmo pmp pms poa pob poc pom poo pop pos ppa ppb ppc ppm ppo ppp pps ps- psa psb psc psm pso psp pss saa sab sac sam sao sap sas sba sbb sbc sbm sbo sbp sbs sca scb scc scm sco scp scs sma smb smc smm smo smp sms soa sob soc som soo sop sos spa spb spc spm spo spp sps ss- ssa ssb ssc ssm sso ssp sss