a-a a-b aaa aab aad aam aan aao aap aar ab- aba abb abd abm abn abo abp abr ad- ada adb add adm adn ado adp adr ama amb amd amm amn amo amp amr an- ana anb and anm ann ano anp anr aoa aob aod aom aon aoo aop aor ap- apa apb apd apm apn apo app apr ar- ara arb ard arm arn aro arp arr b-p baa bab bad bam ban bao bap bar bba bbb bbd bbm bbn bbo bbp bbr bda bdb bdd bdm bdo bdp bdr bma bmb bmd bmm bmn bmo bmp bmr bna bnb bnd bnn bno bnp bnr boa bob bod bom bon boo bop bor bpa bpb bpd bpm bpn bpo bpp bpr bra brb brd brm brn bro brp brr daa dab dad dam dan dao dap dar dba dbb dbd dbm dbn dbo dbp dbr dda ddb ddd ddm ddn ddo ddp ddr dma dmb dmd dmm dmn dmo dmp dmr dna dnb dnd dnm dnn dno dnp dnr doa dob dod dom don doo dop dor dpa dpb dpd dpm dpn dpo dpp dpr dra drb drd drm drn dro drp drr m-o m-r maa mab mad mam man mao map mar mba mbb mbd mbm mbo mbp mbr mda mdb mdd mdm mdn mdo mdp mdr mma mmb mmd mmm mmn mmo mmp mmr mna mnb mnm mnn mno mnp mnr moa mob mod mom mon moo mop mor mpa mpb mpd mpm mpn mpo mpp mpr mra mrb mrd mrm mrn mro mrp mrr naa nab nad nam nan nao nap nar nba nbb nbd nbm nbn nbo nbp nbr nda ndb ndd ndm ndn ndo ndp ndr nma nmb nmd nmm nmn nmo nmp nmr nna nnb nnm nnn nno nnp no- noa nob nod nom non noo nop nor npa npb npd npm npn npo npp npr nra nrb nrd nrm nrn nro nrp nrr oaa oab oad oam oan oao oap oar ob- oba obb obd obm obn obo obp obr oda odb odd odm odn odo odp odr om- oma omb omd omm omn omo omp omr on- ona onb ond onn ono onp onr oo- ooa oob ood oom oon ooo oop oor op- opa opb opd opm opn opo opp opr or- ora orb ord orm orn oro orp orr p-p paa pab pad pam pan pao pap par pba pbb pbd pbm pbn pbo pbp pbr pda pdb pdd pdm pdn pdo pdp pdr pma pmb pmd pmm pmn pmo pmp pmr pn- pna pnb pnd pnm pnn pno pnp pnr poa pob pod pom pon poo pop por ppa ppb ppd ppm ppn ppo ppp ppr pra prb prd prm prn pro prp prr ra- raa rab rad ram ran rao rap rar rba rbb rbd rbm rbn rbo rbp rbr rda rdb rdd rdm rdn rdo rdp rdr rma rmb rmd rmm rmn rmo rmp rmr rna rnb rnd rnm rnn rno rnp rnr roa rob rod rom ron roo rop ror rpa rpb rpd rpm rpn rpo rpp rpr rra rrb rrd rrm rrn rrp rrr