c-- ccc ccn ccr ccs cct cn- cnc cnn cnr cns cnt crc crn crr crs crt csc csn csr css cst ctc ctn ctr cts ctt ncc ncn ncr ncs nct nnc nnn nns nnt nrc nrn nrr nrs nrt nsc nsn nsr nss nst ntc ntn ntr nts ntt rcc rcn rcr rcs rct rnc rnn rnr rns rnt rrc rrn rrr rrs rrt rsc rsn rsr rss rst rtc rtn rtr rts rtt scc scn scr scs sct snc snn snr sns snt sr- src srn srr srs srt ss- ssc ssn ssr sss sst stc stn str sts stt tcc tcn tcr tcs tct tnc tnn tnr tns tnt trc trn trr trs trt tsc tsn tsr tss tst ttc ttn ttr tts ttt