-er -ic c-- ccc cce cci ccp ccr cct ce- cec cee cei cep cer cet ci- cic cie cii cip cir cit cpc cpe cpi cpp cpr cpt crc cre cri crp crr crt ctc cte cti ctp ctr ctt ec- ecc ece eci ecr ect eec eee eep eer eet eic eie eii eip eir eit ep- epc epe epi epp epr ept erc ere eri erp err ert etc ete eti etp etr ett icc ice ici icp icr ict ie- iec iee iei iep ier iet iic iie iii iip iir iit ipc ipe ipi ipp ipr ipt ir- irc ire iri irp irr irt itc ite iti itp itt p-p pcc pce pci pcp pcr pct pec pee pei pep per pet pic pie pii pip pir pit ppc ppe ppi ppp ppr ppt prc pre pri prp prr prt pt- ptc pte pti ptp ptr ptt rcc rce rci rcp rcr rct re- rec ree rei rep rer ret ric rie rii rip rir rit rpc rpe rpi rpp rpr rpt rrc rri rrp rrr rrt rtc rte rti rtp rtr rtt tcc tce tci tcp tcr tct te- tec tee tei tep ter tet tic tie tii tip tir tit tpc tpe tpi tpp tpr tpt trc tre tri trp trr trt ttc tte tti ttp ttr ttt