c-- ccc ccn ccr cct ccu cn- cnc cnn cnr cnt cnu crc crn crr crt cru ctc ctn ctr ctt ctu cuc cun cur cut cuu ncc ncn ncr nct ncu nnc nnn nnt nnu nrc nrn nrr nrt nru ntc ntn ntr ntt ntu nuc nun nur nut nuu rcc rcn rcr rct rcu rnc rnn rnr rnt rnu rrc rrn rrr rrt rru rtc rtn rtr rtt rtu ruc run rur rut ruu tcc tcn tcr tct tcu tnc tnn tnr tnt trc trn trr trt tru ttc ttn ttr ttt ttu tuc tun tur tut tuu ucc ucn ucr uct ucu un- unc unn unr unt unu ur- urc urn urr urt uru utc utn utr utt utu uuc uun uur uut uuu