a-a a-b aaa aab aad aam aao aar ab- aba abb abd abm abo abr ad- ada adb add adm ado adr ama amb amd amm amo amr aoa aob aod aom aoo aor ar- ara arb ard arm aro arr baa bab bad bam bao bar bba bbb bbd bbm bbo bbr bda bdb bdd bdm bdo bdr bma bmb bmd bmm bmo bmr boa bob bod bom boo bor bra brb brd brm bro brr daa dab dad dam dao dar dba dbb dbd dbm dbo dbr dda ddb ddd ddm ddo ddr dma dmb dmd dmm dmo dmr doa dob dod dom doo dor dra drb drd drm dro drr m-o m-r maa mab mad mam mao mar mba mbb mbd mbm mbo mbr mda mdb mdd mdm mdo mdr mma mmb mmd mmm mmo mmr moa mob mod mom moo mor mra mrb mrd mrm mro mrr oaa oab oad oam oao oar ob- oba obb obd obm obo obr oda odb odd odm odo odr om- oma omb omd omm omo omr oo- ooa oob ood oom ooo oor or- ora orb ord orm oro orr ra- raa rab rad ram rao rar rba rbb rbd rbm rbo rbr rda rdb rdd rdm rdo rdr rma rmb rmd rmm rmo rmr roa rob rod rom roo ror rra rrb rrd rrm rrr