a-a a-b aaa aab aad aae aam aao ab- aba abb abd abe abm abo ad- ada adb add ade adm ado aea aeb aed aee aem aeo ama amb amd ame amm amo aoa aob aod aoe aom aoo baa bab bad bae bam bao bba bbb bbd bbe bbm bbo bda bdb bdd bde bdm bdo be- bea beb bed bee bem beo bma bmb bmd bme bmm bmo boa bob bod boe bom boo daa dab dad dae dam dao dba dbb dbd dbe dbm dbo dda ddb ddd dde ddm ddo de- dea deb ded dee dem deo dma dmb dmd dme dmm dmo doa dob dod doe dom doo eaa eab ead eae eam eao eba ebb ebd ebe ebm ebo ed- eda edb edd ede edm edo eea eeb eed eee eem eeo em- ema emb emd eme emm emo eo- eoa eob eod eoe eom eoo m-o maa mab mad mae mam mao mba mbb mbd mbe mbm mbo mda mdb mdd mde mdm mdo mea meb med mee mem meo mma mmb mmd mme mmm mmo moa mob mod moe mom moo oaa oab oad oae oam oao ob- oba obb obd obe obm obo oda odb odd ode odm odo oea oeb oed oee oem oeo om- oma omb omd ome omm omo oo- ooa oob ood oom ooo