c-- ccc ccd cce cco ccu cdc cdd cde cdo cdu ce- cec ced cee ceo ceu co- coc cod coe coo cou cuc cud cue cuo cuu dcc dcd dce dco dcu ddc ddd dde ddo ddu de- dec ded dee deo deu doc dod doe doo dou duc dud due duo ec- ecc ecd ece eco ecu ed- edc edd ede edo edu eec eed eee eeo eo- eoc eod eoe eoo eou eu- euc eud eue oc- occ ocd oco ocu odc odd ode odo odu oec oed oee oeo oo- ooc ood ooo ou- ouc oud oue ouo ucc ucd uce uco ucu udc udd ude udo udu uec ued uee uoc uod uoe uoo uuc uue uuu