a-a a-b a-c aaa aab aac aad aam aao aar aax ab- aba abb abc abd abm abo abr abx ac- aca acb acc acd acm aco acr acx ad- ada adb adc add adm ado adr adx ama amb amc amd amm amo amr amx aoa aob aoc aod aom aoo aor aox ar- ara arb arc ard arm aro arr arx ax- axa axm axo axr axx baa bab bac bad bam bao bar bax bba bbb bbc bbd bbm bbo bbr bbx bca bcb bcc bcd bcm bco bcr bcx bda bdb bdc bdd bdm bdo bdr bdx bma bmb bmc bmd bmm bmo bmr bmx boa bob boc bod bom boo bor box bra brb brd brm bro brr brx bxb bxd bxm bxo bxx c-- caa cab cac cad cam cao car cax cba cbb cbc cbd cbm cbo cbr cbx cca ccb ccc ccd ccm cco ccr ccx cda cdb cdc cdd cdm cdo cdr cdx cma cmb cmc cmd cmm cmo cmr cmx co- coa cob coc cod com coo cor cox cra crb crc crd crm cro crr crx cxc cxo cxr cxx daa dab dac dad dam dao dar dax dba dbb dbc dbd dbm dbo dbr dbx dca dcb dcc dcd dcm dco dcr dcx dda ddb ddc ddd ddm ddo ddr ddx dma dmb dmc dmd dmm dmo dmr dmx doa dob doc dod dom doo dor dox dra drb drc drd drm dro drr drx dxc dxd dxo dxr dxx m-o m-r maa mab mac mad mam mao mar max mba mbb mbc mbd mbm mbo mbr mbx mc- mca mcb mcc mcd mcm mco mcr mcx mda mdb mdc mdd mdm mdo mdr mdx mma mmb mmc mmd mmm mmo mmr mmx moa mob moc mod mom moo mor mox mra mrb mrc mrd mrm mro mrr mrx mxa mxc mxd mxr oaa oab oac oad oam oao oar oax ob- oba obb obc obd obm obo obr obx oc- oca ocb occ ocd ocm oco ocr ocx oda odb odc odd odm odo odr om- oma omb omc omd omm omo omr omx oo- ooa oob ooc ood oom ooo oor oox or- ora orb orc ord orm oro orr orx ox- oxa oxb oxc oxo oxx ra- raa rab rac rad ram rao rar rax rba rbb rbc rbd rbm rbo rbr rbx rca rcb rcc rcd rcm rco rcr rcx rda rdb rdc rdd rdm rdo rdr rdx rma rmb rmc rmd rmm rmo rmr rmx roa rob roc rod rom roo ror rox rra rrb rrc rrd rrm rrr rxr xaa xac xad xam xar xbc xbr xbx xcb xcd xcr xcx xda xdb xdc xdm xdr xma xmc xmd xmm xmo xmr xmx xoa xoc xod xom xoo xor xox xrc xrd xrx xxo xxx