c-- ccc ccd cco ccr ccu cdc cdd cdo cdr cdu cdy co- coc cod coo cor cou coy crc crd cro crr cru cry cuc cud cuo cur cuu cuy cyc cyd cyo cyr dcc dcd dco dcr dcu ddc ddd ddo ddr ddu ddy doc dod doo dor dou doy drc drd dro drr dru dry duc dud duo dur duy dy- dyc dyd dyo dyr dyu dyy oc- occ ocd oco ocr ocu odc odd odo odr odu oo- ooc ood ooo oor or- orc ord oro orr oru ory ou- ouc oud ouo our oyd oyo rcc rcd rco rcr rcu rdc rdd rdo rdr rdu rdy roc rod roo ror rou roy rrc rrd rrr rru ruc rud ruo rur ruu ruy ry- ryc ryd ryo ryr ryu ryy ucc ucd uco ucr ucu udc udd udo udr udu uoc uod uoo uor ur- urc urd uro urr uru ury uuc uur uuu uyc uyo uyu ycc ycd yco ycu ycy ydo ydy yoc yod yoo yor you yoy yrc yro yru yud yuo yur yuu yuy yyc yyu yyy