c-- ccc ccd ccf cco ccr cct ccu cdc cdd cdf cdo cdr cdt cdu cfc cfd cff cfo cfr cft cfu co- coc cod cof coo cor cot cou crc crd crf cro crr crt cru ctc ctd ctf cto ctr ctt ctu cuc cud cuf cuo cur cut cuu dcc dcd dcf dco dcr dct dcu ddc ddd ddf ddo ddr ddt ddu dfc dfd dff dfo dfr dft dfu doc dod dof doo dor dot dou drc drd dro drr drt dru dtc dtd dtf dto dtr dtt dtu duc dud duf duo dur dut fcc fcd fcf fco fcr fct fcu fdc fdd fdf fdo fdr fdt fdu ffc ffd fff ffo ffr fft ffu foc fof foo for fot fou frc frd frf fro frr frt fru ftc ftd ftf fto ftr ftt ftu fud fuf fuo fur fut fuu oc- occ ocd ocf oco ocr oct ocu odc odd odf odo odr odt odu of- ofc ofd off ofo ofr oft ofu oo- ooc ood oof ooo oor oot or- orc ord orf oro orr ort oru ot- otc otd otf oto otr ott otu ou- ouc oud ouf ouo our out rcc rcd rcf rco rcr rct rcu rdc rdd rdf rdo rdr rdt rdu rfc rfd rff rfo rfr rft rfu roc rod rof roo ror rot rou rrc rrd rrf rrr rrt rru rtc rtd rtf rto rtr rtt rtu ruc rud ruf ruo rur rut ruu tcc tcd tcf tco tcr tct tcu tdc tdd tdf tdo tdr tdt tdu tfc tfd tff tfo tfr tft tfu to- toc tod tof too tor tot tou trc trd trf tro trr trt tru ttc ttd ttf tto ttr ttt ttu tuc tud tuf tuo tur tut tuu ucc ucd ucf uco ucr uct ucu udc udd udf udo udr udt udu ufc ufd uff ufo ufr uft ufu uoc uod uoo uor uot ur- urc urd urf uro urr urt uru utc utd utf uto utr utt utu uuc uur uut uuu