c-- ccc ccn ccr ccs cct ccu cn- cnc cnn cnr cns cnt cnu crc crn crr crs crt cru csc csn csr css cst csu ctc ctn ctr cts ctt ctu cuc cun cur cus cut cuu ncc ncn ncr ncs nct ncu nnc nnn nns nnt nnu nrc nrn nrr nrs nrt nru nsc nsn nsr nss nst nsu ntc ntn ntr nts ntt ntu nuc nun nur nus nut nuu rcc rcn rcr rcs rct rcu rnc rnn rnr rns rnt rnu rrc rrn rrr rrs rrt rru rsc rsn rsr rss rst rsu rtc rtn rtr rts rtt rtu ruc run rur rus rut ruu scc scn scr scs sct scu snc snn snr sns snt snu sr- src srn srr srs srt ss- ssc ssn ssr sss sst ssu stc stn str sts stt stu suc sun sur sus sut suu tcc tcn tcr tcs tct tcu tnc tnn tnr tns tnt trc trn trr trs trt tru tsc tsn tsr tss tst tsu ttc ttn ttr tts ttt ttu tuc tun tur tus tut tuu ucc ucn ucr ucs uct ucu un- unc unn unr uns unt unu ur- urc urn urr urs urt uru usc usn usr uss ust usu utc utn utr uts utt utu uuc uun uur uus uut uuu