a-a a-b aaa aab aad aam aao aap aar ab- aba abb abd abm abo abp abr ad- ada adb add adm ado adp adr ama amb amd amm amo amp amr aoa aob aod aom aoo aop aor ap- apa apb apd apm apo app apr ar- ara arb ard arm aro arp arr b-p baa bab bad bam bao bap bar bba bbb bbd bbm bbo bbp bbr bda bdb bdd bdm bdo bdp bdr bma bmb bmd bmm bmo bmp bmr boa bob bod bom boo bop bor bpa bpb bpd bpm bpo bpp bpr bra brb brd brm bro brp brr daa dab dad dam dao dap dar dba dbb dbd dbm dbo dbp dbr dda ddb ddd ddm ddo ddp ddr dma dmb dmd dmm dmo dmp dmr doa dob dod dom doo dop dor dpa dpb dpd dpm dpo dpp dpr dra drb drd drm dro drp drr m-o m-r maa mab mad mam mao map mar mba mbb mbd mbm mbo mbp mbr mda mdb mdd mdm mdo mdp mdr mma mmb mmd mmm mmo mmp mmr moa mob mod mom moo mop mor mpa mpb mpd mpm mpo mpp mpr mra mrb mrd mrm mro mrp mrr oaa oab oad oam oao oap oar ob- oba obb obd obm obo obp obr oda odb odd odm odo odp odr om- oma omb omd omm omo omp omr oo- ooa oob ood oom ooo oop oor op- opa opb opd opm opo opp opr or- ora orb ord orm oro orp orr p-p paa pab pad pam pao pap par pba pbb pbd pbm pbo pbp pbr pda pdb pdd pdm pdo pdp pdr pma pmb pmd pmm pmo pmp pmr poa pob pod pom poo pop por ppa ppb ppd ppm ppo ppp ppr pra prb prd prm pro prp prr ra- raa rab rad ram rao rap rar rba rbb rbd rbm rbo rbp rbr rda rdb rdd rdm rdo rdp rdr rma rmb rmd rmm rmo rmp rmr roa rob rod rom roo rop ror rpa rpb rpd rpm rpo rpp rpr rra rrb rrd rrm rrp rrr