a-a a-c aaa aac aad aaf aam aao aar aax ac- aca acc acd acf acm aco acr acx ad- ada adc add adf adm ado adr adx af- afa afc afd aff afm afo afr afx ama amc amd amf amm amo amr amx aoa aoc aod aof aom aoo aor aox ar- ara arc ard arf arm aro arr arx ax- axa axm axo axr axx c-- caa cac cad caf cam cao car cax cca ccc ccd ccf ccm cco ccr ccx cda cdc cdd cdf cdm cdo cdr cdx cfa cfc cfd cff cfm cfo cfr cfx cma cmc cmd cmf cmm cmo cmr cmx co- coa coc cod cof com coo cor cox cra crc crd crf crm cro crr crx cxc cxf cxo cxr cxx daa dac dad daf dam dao dar dax dca dcc dcd dcf dcm dco dcr dcx dda ddc ddd ddf ddm ddo ddr ddx dfa dfc dfd dff dfm dfo dfr dfx dma dmc dmd dmf dmm dmo dmr dmx doa doc dod dof dom doo dor dox dra drc drd drm dro drr drx dxc dxd dxo dxr dxx faa fac fad faf fam fao far fax fca fcc fcd fcf fcm fco fcr fcx fda fdc fdd fdf fdm fdo fdr fdx ffa ffc ffd fff ffm ffo ffr ffx fma fmc fmd fmf fmm fmo fmr fmx foa foc fof fom foo for fox fra frc frd frf frm fro frr fxm fxr fxx m-f m-o m-r maa mac mad maf mam mao mar max mc- mca mcc mcd mcf mcm mco mcr mcx mda mdc mdd mdf mdm mdo mdr mdx mfa mfc mfd mff mfm mfo mfr mma mmc mmd mmf mmm mmo mmr mmx moa moc mod mof mom moo mor mox mra mrc mrd mrf mrm mro mrr mrx mxa mxc mxd mxr oaa oac oad oaf oam oao oar oax oc- oca occ ocd ocf ocm oco ocr ocx oda odc odd odf odm odo odr of- ofa ofc ofd off ofm ofo ofr ofx om- oma omc omd omf omm omo omr omx oo- ooa ooc ood oof oom ooo oor oox or- ora orc ord orf orm oro orr orx ox- oxa oxc oxf oxo oxx ra- raa rac rad raf ram rao rar rax rca rcc rcd rcf rcm rco rcr rcx rda rdc rdd rdf rdm rdo rdr rdx rfa rfc rfd rff rfm rfo rfr rma rmc rmd rmf rmm rmo rmr rmx roa roc rod rof rom roo ror rox rra rrc rrd rrf rrm rrr rxr xaa xac xad xaf xam xar xcd xcf xcr xcx xda xdc xdf xdm xdr xfa xfm xfx xma xmc xmd xmf xmm xmo xmr xmx xoa xoc xod xof xom xoo xor xox xrc xrd xrf xrx xxo xxx