c-- ccc ccd ccn cco ccr cct cdc cdd cdn cdo cdr cdt cn- cnc cnd cnn cno cnr cnt co- coc cod con coo cor cot crc crd crn cro crr crt ctc ctd ctn cto ctr ctt dcc dcd dcn dco dcr dct ddc ddd ddn ddo ddr ddt dnc dnd dnn dno dnr dnt doc dod don doo dor dot drc drd drn dro drr drt dtc dtd dtn dto dtr dtt ncc ncd ncn nco ncr nct ndc ndd ndn ndo ndr ndt nnc nnn nno nnt no- noc nod non noo nor not nrc nrd nrn nro nrr nrt ntc ntd ntn nto ntr ntt oc- occ ocd ocn oco ocr oct odc odd odn odo odr odt on- onc ond onn ono onr ont oo- ooc ood oon ooo oor oot or- orc ord orn oro orr ort ot- otc otd otn oto otr ott rcc rcd rcn rco rcr rct rdc rdd rdn rdo rdr rdt rnc rnd rnn rno rnr rnt roc rod ron roo ror rot rrc rrd rrn rrr rrt rtc rtd rtn rto rtr rtt tcc tcd tcn tco tcr tct tdc tdd tdn tdo tdr tdt tnc tnd tnn tno tnr tnt to- toc tod ton too tor tot trc trd trn tro trr trt ttc ttd ttn tto ttr ttt