a-a a-b aaa aab aad aam aan aao aar ab- aba abb abd abm abn abo abr ad- ada adb add adm adn ado adr ama amb amd amm amn amo amr an- ana anb and anm ann ano anr aoa aob aod aom aon aoo aor ar- ara arb ard arm arn aro arr baa bab bad bam ban bao bar bba bbb bbd bbm bbn bbo bbr bda bdb bdd bdm bdo bdr bma bmb bmd bmm bmn bmo bmr bna bnb bnd bnn bno bnr boa bob bod bom bon boo bor bra brb brd brm brn bro brr daa dab dad dam dan dao dar dba dbb dbd dbm dbn dbo dbr dda ddb ddd ddm ddn ddo ddr dma dmb dmd dmm dmn dmo dmr dna dnb dnd dnm dnn dno dnr doa dob dod dom don doo dor dra drb drd drm drn dro drr m-o m-r maa mab mad mam man mao mar mba mbb mbd mbm mbo mbr mda mdb mdd mdm mdn mdo mdr mma mmb mmd mmm mmn mmo mmr mna mnb mnm mnn mno mnr moa mob mod mom mon moo mor mra mrb mrd mrm mrn mro mrr naa nab nad nam nan nao nar nba nbb nbd nbm nbn nbo nbr nda ndb ndd ndm ndn ndo ndr nma nmb nmd nmm nmn nmo nmr nna nnb nnm nnn nno no- noa nob nod nom non noo nor nra nrb nrd nrm nrn nro nrr oaa oab oad oam oan oao oar ob- oba obb obd obm obn obo obr oda odb odd odm odn odo odr om- oma omb omd omm omn omo omr on- ona onb ond onn ono onr oo- ooa oob ood oom oon ooo oor or- ora orb ord orm orn oro orr ra- raa rab rad ram ran rao rar rba rbb rbd rbm rbn rbo rbr rda rdb rdd rdm rdn rdo rdr rma rmb rmd rmm rmn rmo rmr rna rnb rnd rnm rnn rno rnr roa rob rod rom ron roo ror rra rrb rrd rrm rrn rrr