a-a a-b a-c aaa aab aac aad aam aao ab- aba abb abc abd abm abo ac- aca acb acc acd acm aco ad- ada adb adc add adm ado ama amb amc amd amm amo aoa aob aoc aod aom aoo baa bab bac bad bam bao bba bbb bbc bbd bbm bbo bca bcb bcc bcd bcm bco bda bdb bdc bdd bdm bdo bma bmb bmc bmd bmm bmo boa bob boc bod bom boo c-- caa cab cac cad cam cao cba cbb cbc cbd cbm cbo cca ccb ccc ccd ccm cco cda cdb cdc cdd cdm cdo cma cmb cmc cmd cmm cmo co- coa cob coc cod com coo daa dab dac dad dam dao dba dbb dbc dbd dbm dbo dca dcb dcc dcd dcm dco dda ddb ddc ddd ddm ddo dma dmb dmc dmd dmm dmo doa dob doc dod dom doo m-o maa mab mac mad mam mao mba mbb mbc mbd mbm mbo mc- mca mcb mcc mcd mcm mco mda mdb mdc mdd mdm mdo mma mmb mmc mmd mmm mmo moa mob moc mod mom moo oaa oab oac oad oam oao ob- oba obb obc obd obm obo oc- oca ocb occ ocd ocm oco oda odb odc odd odm odo om- oma omb omc omd omm omo oo- ooa oob ooc ood oom ooo