a-a a-b a-c aaa aab aac aad aam aao aap aar ab- aba abb abc abd abm abo abp abr ac- aca acb acc acd acm aco acp acr ad- ada adb adc add adm ado adp adr ama amb amc amd amm amo amp amr aoa aob aoc aod aom aoo aop aor ap- apa apb apc apd apm apo app apr ar- ara arb arc ard arm aro arp arr b-p baa bab bac bad bam bao bap bar bba bbb bbc bbd bbm bbo bbp bbr bca bcb bcc bcd bcm bco bcp bcr bda bdb bdc bdd bdm bdo bdp bdr bma bmb bmc bmd bmm bmo bmp bmr boa bob boc bod bom boo bop bor bpa bpb bpc bpd bpm bpo bpp bpr bra brb brd brm bro brp brr c-- caa cab cac cad cam cao cap car cba cbb cbc cbd cbm cbo cbp cbr cca ccb ccc ccd ccm cco ccp ccr cda cdb cdc cdd cdm cdo cdp cdr cma cmb cmc cmd cmm cmo cmp cmr co- coa cob coc cod com coo cop cor cpa cpb cpc cpd cpm cpo cpp cpr cra crb crc crd crm cro crp crr daa dab dac dad dam dao dap dar dba dbb dbc dbd dbm dbo dbp dbr dca dcb dcc dcd dcm dco dcp dcr dda ddb ddc ddd ddm ddo ddp ddr dma dmb dmc dmd dmm dmo dmp dmr doa dob doc dod dom doo dop dor dpa dpb dpc dpd dpm dpo dpp dpr dra drb drc drd drm dro drp drr m-o m-r maa mab mac mad mam mao map mar mba mbb mbc mbd mbm mbo mbp mbr mc- mca mcb mcc mcd mcm mco mcp mcr mda mdb mdc mdd mdm mdo mdp mdr mma mmb mmc mmd mmm mmo mmp mmr moa mob moc mod mom moo mop mor mpa mpb mpc mpd mpm mpo mpp mpr mra mrb mrc mrd mrm mro mrp mrr oaa oab oac oad oam oao oap oar ob- oba obb obc obd obm obo obp obr oc- oca ocb occ ocd ocm oco ocp ocr oda odb odc odd odm odo odp odr om- oma omb omc omd omm omo omp omr oo- ooa oob ooc ood oom ooo oop oor op- opa opb opc opd opm opo opp opr or- ora orb orc ord orm oro orp orr p-p paa pab pac pad pam pao pap par pba pbb pbc pbd pbm pbo pbp pbr pca pcb pcc pcd pcm pco pcp pcr pda pdb pdc pdd pdm pdo pdp pdr pma pmb pmc pmd pmm pmo pmp pmr poa pob poc pod pom poo pop por ppa ppb ppc ppd ppm ppo ppp ppr pra prb prc prd prm pro prp prr ra- raa rab rac rad ram rao rap rar rba rbb rbc rbd rbm rbo rbp rbr rca rcb rcc rcd rcm rco rcp rcr rda rdb rdc rdd rdm rdo rdp rdr rma rmb rmc rmd rmm rmo rmp rmr roa rob roc rod rom roo rop ror rpa rpb rpc rpd rpm rpo rpp rpr rra rrb rrc rrd rrm rrp rrr