c-- ccc ccf ccr cct ccu cfc cff cfr cft cfu crc crf crr crt cru ctc ctf ctr ctt ctu cuc cuf cur cut cuu fcc fcf fcr fct fcu ffc fff ffr fft ffu frc frf frr frt fru ftc ftf ftr ftt ftu fuf fur fut fuu rcc rcf rcr rct rcu rfc rff rfr rft rfu rrc rrf rrr rrt rru rtc rtf rtr rtt rtu ruc ruf rur rut ruu tcc tcf tcr tct tcu tfc tff tfr tft tfu trc trf trr trt tru ttc ttf ttr ttt ttu tuc tuf tur tut tuu ucc ucf ucr uct ucu ufc uff ufr uft ufu ur- urc urf urr urt uru utc utf utr utt utu uuc uur uut uuu