a-a a-b a-c aaa aab aac aad aae aam aao ab- aba abb abc abd abe abm abo ac- aca acb acc acd ace acm aco ad- ada adb adc add ade adm ado aea aeb aec aed aee aem aeo ama amb amc amd ame amm amo aoa aob aoc aod aoe aom aoo baa bab bac bad bae bam bao bba bbb bbc bbd bbe bbm bbo bca bcb bcc bcd bce bcm bco bda bdb bdc bdd bde bdm bdo be- bea beb bec bed bee bem beo bma bmb bmc bmd bme bmm bmo boa bob boc bod boe bom boo c-- caa cab cac cad cae cam cao cba cbb cbc cbd cbe cbm cbo cca ccb ccc ccd cce ccm cco cda cdb cdc cdd cde cdm cdo ce- cea ceb cec ced cee cem ceo cma cmb cmc cmd cme cmm cmo co- coa cob coc cod coe com coo daa dab dac dad dae dam dao dba dbb dbc dbd dbe dbm dbo dca dcb dcc dcd dce dcm dco dda ddb ddc ddd dde ddm ddo de- dea deb dec ded dee dem deo dma dmb dmc dmd dme dmm dmo doa dob doc dod doe dom doo eaa eab eac ead eae eam eao eba ebb ebc ebd ebe ebm ebo ec- eca ecb ecc ecd ece ecm eco ed- eda edb edc edd ede edm edo eea eeb eec eed eee eem eeo em- ema emb emc emd eme emm emo eo- eoa eob eoc eod eoe eom eoo m-o maa mab mac mad mae mam mao mba mbb mbc mbd mbe mbm mbo mc- mca mcb mcc mcd mce mcm mco mda mdb mdc mdd mde mdm mdo mea meb mec med mee mem meo mma mmb mmc mmd mme mmm mmo moa mob moc mod moe mom moo oaa oab oac oad oae oam oao ob- oba obb obc obd obe obm obo oc- oca ocb occ ocd ocm oco oda odb odc odd ode odm odo oea oeb oec oed oee oem oeo om- oma omb omc omd ome omm omo oo- ooa oob ooc ood oom ooo