-er c-- ccc cce ccf ccr cct ccu ce- cec cee cef cer cet ceu cfc cfe cff cfr cft cfu crc cre crf crr crt cru ctc cte ctf ctr ctt ctu cuc cue cuf cur cut cuu ec- ecc ece ecf ecr ect ecu eec eee eef eer eet ef- efc efe eff efr eft erc ere erf err ert eru etc ete etf etr ett etu eu- euc eue euf eur eut fcc fce fcf fcr fct fcu fec fee fef fer fet feu ffc ffe fff ffr fft ffu frc fre frf frr frt fru ftc fte ftf ftr ftt ftu fue fuf fur fut fuu rcc rce rcf rcr rct rcu re- rec ree ref rer ret reu rfc rfe rff rfr rft rfu rrc rrf rrr rrt rru rtc rte rtf rtr rtt rtu ruc rue ruf rur rut ruu tcc tce tcf tcr tct tcu te- tec tee tef ter tet teu tfc tfe tff tfr tft tfu trc tre trf trr trt tru ttc tte ttf ttr ttt ttu tuc tue tuf tur tut tuu ucc uce ucf ucr uct ucu uec uee uef uer uet ufc ufe uff ufr uft ufu ur- urc ure urf urr urt uru utc ute utf utr utt utu uuc uue uur uut uuu