c-- ccc ccn cco ccr ccs cct cn- cnc cnn cno cnr cns cnt co- coc con coo cor cos cot crc crn cro crr crs crt csc csn cso csr css cst ctc ctn cto ctr cts ctt ncc ncn nco ncr ncs nct nnc nnn nno nns nnt no- noc non noo nor nos not nrc nrn nro nrr nrs nrt nsc nsn nso nsr nss nst ntc ntn nto ntr nts ntt oc- occ ocn oco ocr ocs oct on- onc onn ono onr ons ont oo- ooc oon ooo oor oos oot or- orc orn oro orr ors ort os- osc osn oso osr oss ost ot- otc otn oto otr ots ott rcc rcn rco rcr rcs rct rnc rnn rno rnr rns rnt roc ron roo ror ros rot rrc rrn rrr rrs rrt rsc rsn rso rsr rss rst rtc rtn rto rtr rts rtt scc scn sco scr scs sct snc snn sno snr sns snt soc son soo sor sos sot sr- src srn sro srr srs srt ss- ssc ssn sso ssr sss sst stc stn sto str sts stt tcc tcn tco tcr tcs tct tnc tnn tno tnr tns tnt to- toc ton too tor tos tot trc trn tro trr trs trt tsc tsn tso tsr tss tst ttc ttn tto ttr tts ttt